Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c13f08343e59d16…

MALICIOUS

PDF

96.8 KB Created: 2021-07-03 04:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d362e583280d57de962c5623afc2ed1 SHA-1: d9fc759139b6a317f3f8a6809e1d1bcd105e5fb6 SHA-256: 8c13f08343e59d167ba49a3dd25c61ae65ebd18482016112c715940771d82f85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://allytemp.ru/uplcv?utm_term=effects+of+water+pollution+pdf PDF link annotation
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072438a295a5---75469568630.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/253130ab671205cb9f31a8db95387db8/80742759820.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d8c2340d---74090594760.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d8e0604d---51736810176.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c322d859550051be27b4b2574b4564d0/kenuviwuviv.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/395qsql7pmu1lk0ccsf206tvg4/56744004086.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/s1ctvh35e0fos2mh7mhq6rh6h2/22776561478.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/42327362ef256ac011f3b3ba4519368f/xusixofed.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/sopuniwewavixosov.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/12583206700.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/30069324628.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/42198914876.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/nonunefisiboxogi.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/dalakenakaxolurobodas.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b85e9945---jepoziredaboneje.pdfIn PDF document text
    • https://avela.md/userfiles/file/zewavaledimudagipuxa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b37c8b25---zupitasulel.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/96471369156.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f47c87bbe---wokirogiwarowofezin.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a2231bbf---jusujitewivapavonerubumo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/wenewevemuzukavemajoliv.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/74178068378.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/96465661364.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3120a8d7f---46282898132.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4174b4f21---wifujesexa.pdfIn PDF document text
    • https://medlineplus.gov/waterpollution.htmlIn 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_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 10784 bytes
SHA-256: cf69de3d01684f900df9cdb45af7c0e36dd3fffc6951d97af2a6d8b515622b5f
font_01_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 17396 bytes
SHA-256: eee01c8ac5476ada1628957075166b64866138b1274bd56a4195beeb53f82efd
font_02_sfnt_off00015df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1