Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36dd5619bb13c0…

MALICIOUS

PDF

95.5 KB Created: 2021-07-29 23:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18dc57fbecad9a421ce7e5fac0bcc6c3 SHA-1: aab88e983897500ac8adaa6ac6cdba7eeac061de SHA-256: 5f36dd5619bb13c02541c79725f2774592e019ed4e93ce341ca667b6309a6681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=vinsanity+shred+ripped+in+90+days+free+download PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a2aaf3137---ravokinatazonupox.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021528926465216.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/19c1511394e9887ce9f4243d2bac6802/77344865208.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/lijurujulavumoxufamilena.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/oih0u0du3slm3lmbpr2rnniv13/27245560894.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/bafujakalalikebaluwidox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095f5a811918---19002871173.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/78791603351.pdfIn PDF document text
    • https://htchninc.com/d/files/dezawobovegoxu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/eikmbsiclir0c339r94jtpt2eb/relatavilisumif.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/29481481004.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kh6qatmgu3ql9h3vn51f1rptu5/92160060066.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/fupafamo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea526c0ec---dexuge.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b78f30ffe---63461619006.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389af6d2f9---22970905295.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/22424283744.pdfIn PDF document text
    • http://cloverdiamond.com/file/sesenix.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608600bb5ef3b---kulezeponap.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/86208345542.pdfIn PDF document text
    • https://agatanorek.com/files/file/bufelusav.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/wowojiw.pdfIn PDF document text
    • https://promise-land.com/upload/file/56494230938.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_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 17360 bytes
SHA-256: 86fbbc9f860d7167e3c0b2aeb1627dbce09806b65d8ed1e621ff17749134dadc
font_02_sfnt_off000153d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D8 11056 bytes
SHA-256: bd5423d69203c144ed82c0d426808ac676edd4151bcfb6fe0e3164866a90d268

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