Malicious PDF — malware analysis report

Static analysis result for SHA-256 108ecc3f2d9b8d9a…

MALICIOUS

PDF

89.0 KB Created: 2021-07-23 19:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49ec74330879150ea623d38f59f29578 SHA-1: c6e335a36746426d3088b9a507109403be961bee SHA-256: 108ecc3f2d9b8d9a06875a8b9e23f83ad88998b6cd9bc45b3ae9257ba09acd88
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.001 Malicious Link

This PDF file contains embedded JavaScript and multiple external links, including one hosted on a compromised WordPress site, designed to lead users to a credential phishing page impersonating Outlook. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=charter+email+not+working+on+iphone+2019.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://ka-base.no/images_content/file/wuxulalejibubevobubunu.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e25f40a8---faluzusa.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/8036592579.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/88jl768p2fbmlo785hblie57up/68319287062.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/adih0jsrpv8sj1hsoolbb22qh5/dewuzumiduvitomorela.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e3e24d40945c66420098113fc24009c8/81533867686.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3ccf1f00839b6401f8c6bd31f620e386/26263710645.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/viviniletafe.pdfIn PDF document text
    • https://everestart.com/images/stories/file/kifetaw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a16776a0730---kefetotaginipelanima.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b8fe0237---73372206885.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beffa9ec35c---biremekig.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59b988610f3213c2a3042646936d5c69/vedatotopevasavupareka.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/egspdikqrb933bukl1ncigdep3/radunisapodeziz.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/vunetutebukogaxa.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/22061877480.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4fe30ad7c---34616808027.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210703_724A86528AEDB730.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/38243716554.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5fede181b8a03409b7530d7a46bafc92/5854729283.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/46013356329.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d8a5d4b95b90b82673067b781b4d6ce/18273751283.pdfIn PDF document text
    • https://brakos.it/file/zolomumibirodilafabutuji.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/29456765271.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xesuvipipawebujekijulal.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083d888ca2d4---62433103270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=charter+email+not+working+on+iphone+2019PDF link annotation
    • 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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 17944 bytes
SHA-256: 863444f906485c52fc50b5c0ee60da9eae92b36aee0d8dfdb7788edb51305beb
font_02_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 11200 bytes
SHA-256: d75e987c63b6f905eb69d6a69d87e5e611f996d55bcb5b3c3a408cd4f7c8d36b

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