Malicious PDF — malware analysis report

Static analysis result for SHA-256 3906f741a825dc8e…

MALICIOUS

PDF

97.6 KB Created: 2021-09-06 10:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a22ff3a03f619c22e1f62f649aefb74 SHA-1: b08bfbc1e62cff126cc0aee758b28d7f73ddb5d0 SHA-256: 3906f741a825dc8e3015387e08c2ee3fe033ec01b6065bc78f77d96edbec3fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crewmak.ru/uplcv?utm_term=define+organizational+development+pdf PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4e8599d2---gefesinabedanuves.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/wegenolowabonoliza.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/59153541890.pdfIn PDF document text
    • http://zerosquareonline.com/file/23493403838.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76babc37e---lolamorojisagaxe.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tukefazenumaratu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/871f20882325cb4b843f25e98c0b3d37/66924560696.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/34298581149.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/q6eriiu8231jrt8f5uuelfo331/16080783138.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3239b60fe---5049173421.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/79942271967.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/46583673696.pdfIn PDF document text
    • https://ecoretras.com/file/83962695552.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ff34fcec---18494554167.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5dd48709bcff9f6f19663c05a6555a78/16189902276.pdfIn PDF document text
    • http://brlairport.com/images/file/kejodilinuxi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lt90evocrftako9brt5qh65brj/89491339012.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/31801856350.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54815a1f7a---74505344399.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/50ee737acde215329d667c611e1e3d4c/nasebivarajuripemomiv.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/52680064118.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/xofuna.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/gudaropugadukubogixu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b272687bfef4a8935390cf3014fd09be/50602278361.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/vegegavigerosewozes.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_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 10800 bytes
SHA-256: 9389d1c9ab3a011d51e21c76cac2464691544e3d1ca0e5b9dcd00e58d00b4f2e
font_02_sfnt_off00014849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14849 18364 bytes
SHA-256: dfa3f44463ca7495bb8c2ede7bee8934270b75fda5a69976f4504bdc959d4ba3

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