Malicious PDF — malware analysis report

Static analysis result for SHA-256 997c657f73dcbf35…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 08:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74c3e04bd734fe3469271fc9fc793086 SHA-1: fd3221e2a1a7e87c7c269d96ca240a239a25ccf7 SHA-256: 997c657f73dcbf352c6cd8c64d83d96d81dbf592a3367ac06ff1cc8b9a1d5132
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The presence of these link farms suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=airbus+a320+cockpit+panels+pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eff2280e5---suriwimusenaw.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/30c8f0e9ae36a348db6b09359df1194b/denemetevenolo.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e26aa20ba---dakizor.pdf
    • http://acecaalcoy.com/userfiles/file/nefuso.pdf
    • http://vkp.ru/upload/global/file/lumofogikilisegufosaf.pdf
    • http://df-2.de/images/daten/file/dijiniraxej.pdf
    • http://ahkjt.com/upfile/file/xuxok.pdf
    • https://ms01bet.net/contents//files/telagusutopazoguwiwa.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8f308f6c2fbdd0dfb084153be11c33bf/vuvagizuvitizu.pdf
    • http://santabruna.cl/upload/file/kexax.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/53638074499.pdf
    • http://hoskinspugs.net/clients/40498/File/pirukirero.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/jiwokaripovutek.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18642b2b9---76586833073.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/63fe2107b2b967b97951e1c4ec3641f5/514520645.pdf
    • http://frchem.cn/upload/files/91843946992.pdf
    • http://biometria.pl/photos_fck/file/diwuzagajamarozolez.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/23675775802.pdf
    • http://nollve.com/img/editor/image/file/bumevin.pdf
    • http://madmojo.com/fckupload/file/tejero.pdf
    • http://china-engine.net/ckfinder/userfiles/files/mabovekor.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wimiluzo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d468ca7c3---83312052745.pdf
    • http://jnafarms.com/clients/864068/File/78758466140.pdf
    • 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_off0000efeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
font_01_sfnt_off000107fd.bin
2cefb5a99e6c303bb4f2e17c17110b60185ef76235dc37b63d34466fc03fc1aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 17608 bytes
font_02_sfnt_off000134ea.bin
a982cff141fa78248a9291b864a0d57ef87ad8dd13c8bb2039d5b4025dca33bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 11340 bytes