Malicious PDF — malware analysis report

Static analysis result for SHA-256 9688ee9e18e8e372…

MALICIOUS

PDF

77.3 KB Created: 2021-06-25 03:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ffd4b637e2b0eb82817cb1d30b80a38 SHA-1: ef971fe771e4c44f56c2e6d201c09add8a0e1202 SHA-256: 9688ee9e18e8e372b6bd8ac131543c490f28ce304d7685bb603d26e5a6dbc97e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee621850e2---nugujanod.pdf
    • http://bclgrouptt.com/userfiles/file/vedopudiguz.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/31b757f94460feb05b544009db5492ff/88650542015.pdf
    • https://ludifrance.fr/userfiles/file/39289235551.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c83db28dd8768ebee9736f6e838ad42b/sodiwanuzabofiv.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kullng70743ingfpn7daq0a23m/zirepemum.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56b2df33253fb50d4ecc76ec24f48f3d/vulagodexifawatiwuroxuz.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669b938604---nabakonora.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6186855ecb9642a9df985405a4dbae46/41773981907.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52663cb3d81bbc77ede22ac5992c289d/rupuma.pdf
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/548731956.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d246c23d8e45b71613eee8faf07eb4a3/23560909721.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/daa00baab1182311a22fd094662a19be/45855475946.pdf
    • https://basisnomor.com/contents//files/2276546372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+music+library+on+iphone
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/65961c18f7a5366081c5f1a39774b70d/69851836587.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f008.bin
e148071b45890601bc3ba1988c8b7b2472a5ce12a603e7a6cd48f9b511875d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 5608 bytes
font_01_sfnt_off000102f6.bin
1b875ca6465e5659e4c880f9cdaa9103b56629bac5b3e526f867208efba74503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10364 bytes

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