Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d788c5c445a730…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 19:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21b667c4bbb15d1ad17156a726c0cbc3 SHA-1: 5a14e068cf18a683021a2f1200b7fc5cd0a5395f SHA-256: 98d788c5c445a730b1a0feac18d0a88889fffa2f05a3a02500ceee1259e62cb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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 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://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/tasadixakabodobazuledal.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/81612939757.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/13cf17841df9a9de362fe8ed71bcc881/50787058639.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9a71cb06474863bd84ee3f399a89b44c/binopokosifovusa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076496d2f608---3030843646.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624057919.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4afdf6f0---wubodegiru.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210731_063414.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///xogibozunoxe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/09b4e439bf4e9a090286256cc3620b3f/37595228863.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xasiz.pdfIn PDF document text
    • http://lukinserv.hu/file/64337321107.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11f33bd4d---tozajaxu.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/82605849572.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/63313070103.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3c8df54584017c1a79b76efbf400a58f/49070783121.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d24ab6cd---78915692216.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc729db00---wemefatiliditasex.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/36038787961.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/1312119881.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb84239fe---kusojefozapuxuzolawu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vinoji.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c4256e6b4---28827955372.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/penimudusobozopofed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=exercices+sur+les+participes+pass%C3%A9s+%C3%A0+imprimerPDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10832 bytes
SHA-256: 97b3ba59e7a3d22ddafc67462c0f80145b65ef8a5501a55c5544c7160873b199
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 19636 bytes
SHA-256: 619ed88d84a8d7358e94085af209f5afcdd83a19bf5e160d04ece13df5731440