Malicious PDF — malware analysis report

Static analysis result for SHA-256 88773007feb0aba9…

MALICIOUS

PDF

87.2 KB Created: 2021-08-25 10:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e92775ee1f908599b5b5b405837358d SHA-1: 1a71ffa4bd94576712e7ea2da46dd3c9536e90d4 SHA-256: 88773007feb0aba9dddd11003a0f390e451f4c4eef37ce2af77c46bef7646c02
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomorecpapmachine.com/userfiles/files/70398913425.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16205911413105.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/60fde1573699de217e7daa5258991bf7/wanene.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/xegeg.pdfIn PDF document text
    • https://aashianarealty.com/file/fobugudofepulokiribu.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/kadamajugefokibupawesixej.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/zewujixotivizenakefan.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/40518485087.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2a5c6944401d3dda32e369c333283f6e/mijejowavupujaritetamo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sjsvhnogg6qbrm9ue9vo69lf1u/bezolerijogetulok.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075599a7e616---gumokome.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8895c0ef---53156195372.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/19417538235.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/kolufi.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/vonujomer.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/4504844713.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tevufexovudodoxopapasabog.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/69125014728.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091558371df0---kaxiwamixexolavo.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202108011711126043.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6b82407e09a9079cb536ee69d1bbfc96/susefetojojojuvalefomemen.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2b747792596f6506ee02c93e8fa5710c/satulotufadusawov.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/5956507878.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ecaee985f110a3204c452a5c06e78838/jadojajowaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+countries+with+constitutional+monarchyPDF 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_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 10856 bytes
SHA-256: 29bb285f0b71b638f677eac95c67d692258295e9c35d584ea2ccda0d27facb64
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 18532 bytes
SHA-256: b62b76b9a0822631044f6d27073687794075d661f15e0a50467287ab11da1111
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1