Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b781f429b2c8735…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 514e33f32aebd320c962b0d6f8d4f715 SHA-1: 7d28bc98730d5469964b33ec9e2df987935343a3 SHA-256: 7b781f429b2c87356297abb895136151c898b7b1ace04bdad1b29ae3c3d0cdc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=radical+acceptance+worksheet+pdf PDF link annotation
    • http://519pf.com/userfiles/files/74181770354.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/tunagolexutasomemi.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/5423600348.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/59486509913.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/46372108192.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/powapiviruxatorerosuzi.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/74696414728.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/lojiduvukuxuguvamef.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/boguzu.pdfIn PDF document text
    • http://24cvety.ru/upload/files/fewutorogetarajatopopubi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/35672665828.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d814adc0d9---15929630215.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/60427451067.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/55055222555.pdfIn PDF document text
    • http://torgoborud.org/images/file/75964999377.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/99373771972.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/94483562871.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/nefomeluvazu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/511e5119b2e20c67d6fc8dfd30e183a4/27973743282.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fureluzonanakovojubi.pdfIn PDF document text
    • http://logicamail.it/draft/media/domudezozefolofuvema.pdfIn PDF document text
    • http://aminotp.com/upload/files/81081247476.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/gunobibanibiz.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109060051369009.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/43861513805.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2956b4f8f296517f4cfc142282dd5e91/38761951321.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/worekufurefavonatomale.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138173ab7a47---kakukolozagufemetu.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_off0000bd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 15836 bytes
SHA-256: 96e71840713f2dd9da7e40d6f7f1838a37325ac51ce8599439105ceda610b9ab
font_01_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 10940 bytes
SHA-256: 8d297611b326501e170eb91037c81f21efc6547161ee574e0970361e0a76c27b
font_02_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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