Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3a775d0e12f55b…

MALICIOUS

PDF

95.7 KB Created: 2021-06-30 02:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e26efc8fcf2e0adf36ce5281ae0711ff SHA-1: 12ef09e617c57cf68b85d964f55ad93cef0f1d94 SHA-256: 8f3a775d0e12f55bf77155ebcfcb031c8a3a85c8b45f5e8e242893789ea31262
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential harvesting lure. The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a phishing campaign. While no scripts were explicitly extracted, the 'SE_MFA_LURE' heuristic indicates the document's content is designed to trick users into approving MFA requests or entering one-time codes, likely to steal session tokens or bypass authentication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://laborke.ru/uplcv?utm_term=narrowing+esophagus+icd+10 PDF link annotation
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/tf31oktafournp880qvr3hs790/rinuxalasubukikavimap.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d017594a---45377067209.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cbc3f8d885d6da82023e9ec051d3722e/89158472141.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d3677acb---xenok.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/jefajogikowefiwaf.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/suboteloximisofoxarodixef.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/jovufogu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0e2644ae531b4c2fab01721ad3baeda4/virigakojomejezex.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80f184ff3---88737942772.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/bojezekan.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/xosegimof.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5a1ed684---sixibasesi.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/xasemiwakuxo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/261pordd60hme8ju863hel0lg9/90371106643.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d143168e51---watirisava.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/lg51to7id8f1a9dh2aiu9gcvs5/jilufa.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b4d8460b1ecd2b3eb31e2ea634cca90f/63965014539.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfb1144eb---ruxiwibikojobipudevunaxa.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/zobilosis.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/ec851cb864e11809c7f918508f293b68/9945988794.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075c722b0c94---sobamudakigopulagit.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80218670448.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4a78f389c1ffa2466bc8e472bd48eaf8/85252449147.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d94a2d05161---87651677015.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zebibisironigegovo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aiss95or6m66vekqcn1442vv5l/85854627601.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_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 10984 bytes
SHA-256: 2d484402257a7db394123215e2e22eddbdd65b8b3bf6d2ecb0af2775cbdcc82f
font_01_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 17948 bytes
SHA-256: cbc3e2633113e23a1c7bcfb0f78f336db0f8e76a2fb2b45e9af75d9c2d6d5393
font_02_sfnt_off00015968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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