Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3787c4039d4206c…

MALICIOUS

PDF

112.8 KB Created: 2021-07-06 14:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e932aaffa3dc08e22505dd7c22811068 SHA-1: 8ec1e5eb22cb5af934385f853e7e843d65699887 SHA-256: d3787c4039d4206c9896ade546cdbff6ca8b4978ed48ef7beb79442116943d3c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicate a tactic of using link farms on potentially compromised infrastructure to host or redirect to malicious content. The embedded JavaScript likely facilitates the redirection or delivery of a secondary payload, contributing to the overall phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=knife+blade+drawing PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7bdf4c2a99673fd0fadeec2b302a1e07/dozakig.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/72544408367.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39976604a3586235d53d7dd5d3e47ec9/99267419346.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/kibujelojuliperusawatu.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/sewunejuwok.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5cc361e3a2a92ba13da6d7219cd09553/42291919787.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9pf14qqr6aso385m78m9v0p5e5/98956197271.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f300b00bc30ec6e96eb681bf13c7882b/wovubulakoxibawazekexij.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/kosejonepemijetuwun.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210527_7501BDDF52D0A993.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/wojilopa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36db1cc311---58917017600.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/bogibijitulavaf.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/resilova.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8af3507847c67fc0cdb64f7d9a31e157/kowasesazowakabesifidoj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a4f74453---fetomuxugenadufizetali.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/31885706780.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/50836086593.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210601055136372756uet2hr.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809eb419351---73065588457.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d36d9725---75250159759.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe38cb408d---9621674822.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609596d066967---pijobode.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_off000158ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17101 10360 bytes
SHA-256: c61c97f90a90422d0e1bbd79eed3959ea510453c6d1cac8d7b0124d41af650ee
font_02_sfnt_off0001884c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1884C 17604 bytes
SHA-256: 3bb483f71110c87ace2c150a62bc17cf32fa288f5324d1b2d5f4e73d4a1de8e6

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