Malicious PDF — malware analysis report

Static analysis result for SHA-256 346749b2fd2e8b33…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ceba6385cae3df51cee49ce710eb6f9 SHA-1: b4bc044f1e9c8a63f7d41a48dcdaa984a1256989 SHA-256: 346749b2fd2e8b3370e0cf8a9133652d3661552685fddd77b127db94c7c490cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates the document's primary function is to redirect users to potentially harmful external sites. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b150d5d3de8120c196ed4c571f9674a2/ludifuzizevekef.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/73172280668.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4101b3f947e06f8af0aa65a403391b28/guvemorejetifusirixuvu.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/87203958378.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/buvududozudi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c83628d53---646033418.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b414c735fd---dezemuvozodak.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xufur.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/392d899ff052241ca29090bd53dcda2a/kesufapidoj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8294c2a8ab---84178186944.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dce5a86bfadaf9cbfc0578c7d27a2df5/52293427616.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c3cb3fc0857e7d837e372a9f133a8f0a/33747422717.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dc0113bfd9b378683505eac5bbb0eb7e/68114411993.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gipomon.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/54615099143.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hkhehq625akh7efph2m3lpg1u4/58646886782.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/fomemagutopurejijog.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb480d6188---zubiverivejasofefiwuwe.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6afa18adb4e353db7a6641cf9fa9ae65/59313682749.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/38838687073.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xafepiwavedozabekepas.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/damukogawupodorakomivel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=protracted+in+a+sentencePDF 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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 10316 bytes
SHA-256: 767e4c17c91398daf6dfe88be51fe664dea6db61762c3e51968e4f869e093666
font_02_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 16428 bytes
SHA-256: 4f59d0556ec1fc9fc1f7a28d3b4da4ede6017ee3352f5a4028973428f439c220

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