Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e5cc816c57fe04…

MALICIOUS

PDF

85.3 KB Created: 2021-08-02 08:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b41135640c9fdaa64bf30c5d947bdc82 SHA-1: dc47bc6efcf454dd000a1c8c5e17d308bee6636d SHA-256: e7e5cc816c57fe04e4bd2045cee1c8117cfeeb0b329725838cc92d5c1b6265a3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a credential phishing lure impersonating Outlook, directing users to a link that does not match the impersonated brand. The document contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to host the final phishing page or payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=outlook+can%27t+add+yahoo+mail+account.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vasvaripalmuzeum.hu/upload/file/bobewelinesigoximibi.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4cb896e4f4de3ae0f82e2be4241d5621/65532757561.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d15a9af14---37864768516.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/vovoluverafaxasi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656cb32c74---24904656014.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/20fc726db50529a915a69d616743be81/61864699543.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/natotufoze.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8c5c376e601d77135f8d49cfe02e3228/99157937809.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/78596473649.pdfIn PDF document text
    • http://allasclub.com/campannas/file/52552830603.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc484e08a1---91424297000.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wabamilevopawinizesijakes.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750676c1735---letavurimo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/75189186265.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fc51083857a9fb324d0cc4180d8a33f2/94427406557.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/91461231784.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/vajopogasojegezame.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9443bd3ec5---wilinebotudox.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/8b7e95e1e34673b81a84e17d4ed83d7f/senovifizimalelugadubefa.pdfIn PDF document text
    • https://senhewood.com/d/files/58255804894.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/81047334641.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/wokeburuwakulu.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/95094927957.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160784bc6cd501---pelubelemejezix.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745909e7400---47580991476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=outlook+can%27t+add+yahoo+mail+accountPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7d329b6a1ddb71fdece310b52bf0d0dc/60885302378.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 16344 bytes
SHA-256: 704d651d31047f949cc5596e480104c178ab2c7ccb32056383456ecb350532d2
font_01_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 10600 bytes
SHA-256: a3dd75be7c93c8b8dbac372be7232d1ce37ad7d918686cd784d8687d5ebba577
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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