Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09cd37be18272c0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 10:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7407c682c732453e1151e31f9fad3046 SHA-1: 25c20cb928862529f371ff7f736a8f839f33a141 SHA-256: c09cd37be18272c0a7c16287564ba8e7d166c07b40f7a616ab68ebb8ca7c7403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ffac592dd3b0446ba0c78bcdc03d86a0/bobojebufudinexo.pdf In PDF document text
    • https://dbmotorbrokers.com/userfiles/file/buxorul.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c2337c16e---dikozisopogugulifigopoge.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210729203132.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/97861975106.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/kowofoze.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/1519883593.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/milijan.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/17624469037.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf267c11be---perejonisapuvu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/15381783522.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/davazuro.pdfIn PDF document text
    • https://kimansion.com/uploads/file/legokotexegesatu.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/97703620495.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/rugumutego.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984593da69b---62106733125.pdfIn PDF document text
    • http://ore-processing.ru/d/files/93728773211.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/vuxipoko.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c0dac37ee3d5ab20ba331e31fb5c2e48/44873959990.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/5193265260.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160944768817d4---47479400974.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/wixidojuret.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/8311176961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lord+of+the+flies+chapter+10+pdfPDF 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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 18612 bytes
SHA-256: f7e3c5477d61697f5aaa1e978aa745124e719bea405f94d9cf3813bbbaa90f05
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10744 bytes
SHA-256: d54a377a8bc62eff987a7d427d3f27c1c694eb543523fc75458d3d7b9ccadba6

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