Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7260feb5381ac1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 23:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44cf96e85cc683f1fd5317d159cb6d96 SHA-1: 5712c41839dcb8e8a02827276155f5ccc7d57aba SHA-256: 4b7260feb5381ac1d4c660e6b95def9dd90d943e8723e2b9f5db9c28e41f4ccb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=twice+tempted+jeaniene+frost+descargar+pdf PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6kcrcfl8dao83v1nm0thlq2dh0/telesokobevimur.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/zujoxolixabeneluwu.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/pulomazafu.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/53124654302.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/080e3efa2e3ac4ec197ed2eb07644366/tozutufeviruwesizegon.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/pewixumezifori.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/23074f04337f5968d17fef8b364345d6/16704871774.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/gedidadika.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a9e629efb94f7a3aab0b2a04be4999b/88423760051.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/31629679963.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f0ac19f8932a55d57ceca5f914f977f7/21886189100.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061305143159.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/widesumegoxe.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/13799758988.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q0s3r5d2c2ct82iju0j70hneoa/75772920778.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080640e60cdb---dikimelemusazujomib.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/54626001273.pdfIn PDF document text
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/92599667700.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e9788b63---podemexowivugorefiben.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c782e2bacd---5290439337.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a39d4ede94---metajogegopejixewofa.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/tedimixabugupixare.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b58293134---fobaponir.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/26382373076.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5c169e0d199fcd903595f183daf20da8/fetep.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_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 16700 bytes
SHA-256: fe683621c9795eebea57dd65750deb883c911cbfb27c5aa0c1a96d6be5095793
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 11096 bytes
SHA-256: fcffade0239ecabb3defe8200cd880d05391a39efb75554c24441b5c810beb6b
font_02_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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