Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef54d03fac9843ea…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 02:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f41162e908e841b3d5ad5985056305a SHA-1: 3fa3137c3fe8f189cd5bb033b649b64defb4c688 SHA-256: ef54d03fac9843ea88e96940bf76aef58b3b77ea973b05a9fd93895b4d8ea343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of multiple external URIs and the nature of the hosting point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf75e2ebffc0c4ae559655b7a2a74fc6/50415292466.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce4d53756---47185740215.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853257204f3---40209118087.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d180aee98---34316978517.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb27a676eb---45830883548.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f9956c54---74302023611.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/74282049335.pdf
    • http://beastyenergy.com/userfiles/file/jupepafew.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aabc7e0c2---gafobetemudapufomasuj.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607247f427148---divatugajep.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vopiwamo.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da38df4bede---jajuxemubawigawejusav.pdf
    • https://wecareprogram.org/images/file/62644531823.pdf
    • http://rheinmotel.com/userfiles/file/zufafavomepur.pdf
    • https://baongochoa.com/upload/file/51149586425.pdf
    • http://khanaphatgroup.com/UserFiles/file/guzizaje.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/86cf71b897b7662d05c831af758f913a/gilamurewufilaw.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6589d6a98c06f216588a0ac2d9f6ee87/89188342085.pdf
    • http://astro2sphere.com/admin/images/file/damifemeturuvibib.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9c7b459c---figegaladekutusijogore.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e347031bd4---zonigexodoro.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/c3okajpkk8mstkij0f3terjlap/92423007413.pdf
    • https://actor-conseil.com/files/file/48819751111.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=a+few+hiccups+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 16792 bytes
font_01_sfnt_off000107ca.bin
f3541dd8e62d4ef0756f0612f341546df5a9b7b40a2511f05a8e3bb5b64292c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 10732 bytes
font_02_sfnt_off0001205d.bin
ca17e4170bfda1c1c0d3ba96e981c55831da065e6513249efd4582971dd50a98
pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16804 bytes