Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae31bae0ec792be…

MALICIOUS

PDF

89.2 KB Created: 2021-07-03 20:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b33a5ad391aea540bc06bb44e0ea36e SHA-1: 479f9fccd85fc875a1938304f65fd6c9886c386c SHA-256: 5ae31bae0ec792be6cfefb3a1ee718613b589897c505b39453322039ecaa49a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. While no scripts were explicitly extracted, the nature of the embedded links and the detection signatures indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/didejavibodapawuravotavar.pdf In PDF document text
    • http://rehahomecare.com/upload/editor/files/nonulazefunedimilisafajow.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/tedojegotilad.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/53665771106.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607006cbe1022---vijonebuwupapukejotob.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6enq3laiki87sjjv04udc8em1/bevuweberutuxa.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/43597909741.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b337f127---zariku.pdfIn PDF document text
    • http://tochuchoinghi.org/files/bigogutipagenejiba.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/38406648615.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ee335be---30689271815.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f84a21dc8d924f693e5256aeff4ad181/69999241029.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8702ea9d13---vusasinenita.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607353946de86---sibejabugexopozidilolimo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b0a7a8796---51169909828.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/97912553431.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a6d37b84d3c1fb85ade879ae4a58c348/mulakizixegiwatujo.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o4a2qv9q6qvsd6a0q0gvqnpt31/82699787862.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/73475083634.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/45624227e03618fbb95b1ac1ab245aeb/wugavinovazezakeguvabiv.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cfcb2f9d---93623190823.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e2b7e0ad3c30f2bfeaaba0e64b2bb029/36540245294.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/43066554201.pdfIn PDF document text
    • https://avenue102.com/uploads/file/kaviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+bootstrap+snippetsPDF 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_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 10316 bytes
SHA-256: 06570dc5eb662ae984290c658817640e1e7365b15900e0ab5248691e04d0d8ce
font_01_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 18156 bytes
SHA-256: 0090aa11edc30eac2039c13ece8eee5764970d4e7ce287c69b902216af527dfd