Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5a920c98ff11c1…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 11:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79f73ca9e79b280fa60252035f0ab858 SHA-1: 5fa0cdb3634a15ff4f0f03e3908128086a76cc56 SHA-256: fb5a920c98ff11c1bdbbec4cc9ecfaa008262f5d5c966bec47f1cfd3e76d9027
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, and the document body was unreadable binary data, suggesting the primary malicious function is the redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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 https://iphonerepairservice.nl/app/webroot/files/userfiles/files/tudobemozabadokegev.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080580d88155---45023235005.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5f1271e2---bekopodovikin.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b8704f9---pawawamemidubade.pdf
    • https://senhewood.com/d/files/losimumumetozododexubab.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/02f095e2121b6b9a36159a137362d851/66768001261.pdf
    • https://netpage.info/userfiles/file/73675618273.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ac440966c9a5eab6ab6fd45215ea6b96/dizavekonuxag.pdf
    • http://bendhorseride.com/userfiles/file/gitiziritililanogokune.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a752bacbdc5dd6955717b5aeb8c2c3ae/porasig.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98e2d1b469---95435658292.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/98304bbffc4c2d3818c34e5e3f023e10/2205469816.pdf
    • https://tomas-music.com/contents//files/46169171075.pdf
    • http://residencecarlofelice.com/userfiles/files/19515581573.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9bcf7f0c1---tobatoveteduvak.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bb9252ec6bfab23994eaabe4d5e9f4fa/xakixinuzofivotodozalepe.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3f279ef72e0c1d8298eb975b3a5d237c/suwigiwiv.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9614e5bf1---13352223080.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/aba7e14e09208e650ba9bb28231b0aae/43406570092.pdf
    • http://www.allatpatikapecs.hu/images/file/nalebijalexogiralesegu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7adbd732---luveturur.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/4d5b6fbc9fut61ndnq9t8fk6df/76845078778.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091d89377ec5---varodusasepalofej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=house+of+cards+chapter+15
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010955.bin
32f4b0bacbd62633585b74671cd811bf05b5c22da9e908694345f77e505dc5dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 17636 bytes
font_01_sfnt_off0001378e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 16792 bytes
font_02_sfnt_off00014fa5.bin
5e5d28c56d20109f495c86654b08b48ce4e3f6b41c5b3494927a6361b443f2bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA5 10752 bytes

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