Malicious PDF — malware analysis report

Static analysis result for SHA-256 81992586d857d7ec…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 03:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9591fc6266f07a60ca213a1f2635d52 SHA-1: 3e77e41f88c31db41bec50cd404aae12e804b71f SHA-256: 81992586d857d7ec41bcd01fa6431708ed08fdc254d5af4b428c000f4fdf4810
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742195c2424---19467856735.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/aa0362b5bb4c97b0113cc8685566b542/webiziwiranaduz.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5f93993b92366789b528707e8971f030/38459760064.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbff5e379---xoloweriku.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/63937951344.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab500053b---40031039149.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/loruzi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7fjd0r3g98a6fam6u3k916bot8/seroruvadidip.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/79679643638.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7144668970---46234078497.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/dumekod.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4dbe3db923f2891759f9989168b9b5dc/36472125649.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec9b695ac---93182137614.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f9d397b529bfbe6336f4c99c79fe6467/wigosigalulezusaxexasijon.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vn9113sg410t1qjrtm5v3so0k3/tipudobofu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1ef61b8b---kinigadomegotevoviwaga.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/63696122976.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3b65574df---58168623149.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/30008785308.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/39456298636.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5i6aqjt977t2nut9qhf897kb4c/17947170951.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d44c6f560---14467127160.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f443ebd158---dugemafu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855079c8b94---rususuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=name+the+three+types+of+muscle+tissuePDF 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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 17032 bytes
SHA-256: ea9052175cde5fed143b1206d8a863ff5aa60121cda977f3af967ebc083def50
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10832 bytes
SHA-256: 6dfe6e1fab7b28a54e1c75c5aae60f3dc139e972da2504a0d55ebfbdff234ee7

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