Malicious PDF — malware analysis report

Static analysis result for SHA-256 004d08a1b55e1bb7…

MALICIOUS

PDF

103.6 KB Created: 2021-07-31 07:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6246c88b1238bbe0840a30eed227f6b0 SHA-1: de9bf84289806db406cf58d331848589458cdd67 SHA-256: 004d08a1b55e1bb78bf6b9a2f378998a5f3c83429b6ccf73353b468ac2a94f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious document. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1t63pv9nanq33obam41q954324/nutojamatedililubig.pdf In PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/55349670016.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/18894035054.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1517ea1d2---fewidijuzijepemel.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/us9f6rkd1fpncn07lloucm3la7/29994512925.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/4693573784.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/53940528961.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d91b700f01f---60756423521.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/etf6th3bmndp44ep41aplhb29h/pikesekabaxusa.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/wuximunure.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094962638d89---lugafutodofewovevadobo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c003461c6bb---27162924726.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6218281750.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5cc333d4---nizaragiduzakozurikipexe.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/43b4adcc10276d511e06c1344ced43b1/61384575227.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t7rge19qajut50ce2jgfqp51ft/povaxogexigiwofu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77be7b1cd1---vavowujudofokanexubimebej.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/84437735860.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/491913293c4b8a080653d076d3f847cd/64772691803.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5ch5cuvr1d8712skd2c2u546fn/vugizoridatinugumana.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88c0b3eb20---pokexifigopujokivawo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5c7a028f---xiwebewaporuronipipal.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/96169284719.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607584c070ddf---lipazovo.pdfIn PDF document text
    • http://mav-auto.ru/images/file/70031985495.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/fidogiwopes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pathfinder+2e+advanced+player%27s+guide+pdf+freePDF 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_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 17576 bytes
SHA-256: c687c981e032872524e9aaadd4a9bfffbb03e2941749804fa5c14817e0dac28d
font_01_sfnt_off00015c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C31 11216 bytes
SHA-256: d299ef2f39ce0c3534f499d6d2def1c3c11d67eab14eace6ee8c01a56f6b46de
font_02_sfnt_off00017654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1