Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bed4db86d12fa9…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 02:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a57e817b6e4febd158a98f155647c335 SHA-1: af36e5b13d9d5a1613b3f66379edbbe16e07c656 SHA-256: 12bed4db86d12fa9996aed12effc9256a5ea1459b884f4516c122026696b0af9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://svx.su/ffile/file/61171979778.pdf In PDF document text
    • http://etkindenetim.com/resimler/files/dirukosi.pdfIn PDF document text
    • http://pnalog.ru/images/file/13724061046.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/52282309028.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c87fd944942---wadikumizupi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hotpvdnag4a9aiutblsb10jvd3/mupunek.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/41948126003.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/73220190489.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/donitogara.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/82864836209.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d192b13cb---45801596112.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087196307a19---mobefipovorogipepidi.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/xepilobonigumaziwurifovuk.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef50bd45d---21172908531.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6f944fd7---36045215020.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b6c5517e5e2e59c2b9de8b35e9437655/fazow.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b1a6ce2f36eeebd12466e9239188028d/jowotovijadoxo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/xotonuvujonexibesalobiso.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6a7b12f2b2dd99e9067978e893503233/99562830168.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/30036433828.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf0ad889fe---vewipomikomu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/cc20spokj33ei9p0dfg6e9q3ov/wiputagakedejunixu.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/pusokexafit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=horton+hears+a+who+online+free+bookPDF 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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 16724 bytes
SHA-256: 4c8774fe4094af7417ce6b88092c162cbc373d07d47677fc944d26fa37312317
font_02_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 10620 bytes
SHA-256: 0dae69f7ac36609ba0b5a6c6f1575e7c9efc5b7bca140b0fc6d928cd14e1b2d1

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