Malicious PDF — malware analysis report

Static analysis result for SHA-256 34190960aff1ff8c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-08 22:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6626beaf6e5d4336ba5f19b974df53c5 SHA-1: 22897777f61ccdd3aeb6b3325f1bd709b68c58a2 SHA-256: 34190960aff1ff8c60b1916362b54136623d28a9f7324562b1bf8bcd82e9d31f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://queure.ru/uplcv?utm_term=when+is+mha+season+5+dub PDF link annotation
    • http://www.giuseppe.ru/ckfinder/userfiles/files/81552228883.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/duwevikematumovivod.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/24271815500.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613532da9eb35---bekedusizejotelonakep.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/kudifuxagosuromodupe.pdfIn PDF document text
    • https://bak.vn/upload/files/21588535481.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemerolixovumotuzib.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/32021485660.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/lutotubevidefo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/tokuwamutixe.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4b1d9c9a89e328afcb85b6934b11c70a/4200372572.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/74750336971.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/kuxuxefugubogir.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/391345996b8c02a88adc916fac8b20e8/kivijagodatibumokopov.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/48477282972.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/13262975380.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jetufukuxa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c140ef6---bumaziralafezunakum.pdfIn PDF document text
    • https://allianztc.ro/files/file/wukufima.pdfIn PDF document text
    • https://izometal.net/mm/file/wukulege.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/24680623853.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/pimefi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc75b021b---gilufa.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e0d88b84---fakutivagewomenurare.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_off0000baf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF2 17696 bytes
SHA-256: 78457d5d36e44760af9861a100232e4c8fa4321d1efd6348c414142e0532f83c
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10636 bytes
SHA-256: 885f06ea6af2b063cb96736423319b4355ae0c225daf412469c01b1edb8a9747

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