Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cce33ad0892748…

MALICIOUS

PDF

72.9 KB Created: 2021-06-22 15:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af8d08c02f162084f1dfce1fd9fd8e4 SHA-1: 860675fb5ac6ffcbbf0192ad0ca4b43e7d0ef1b0 SHA-256: 83cce33ad0892748b2dd50a5e3e75c59fa224af3bb80cef323435eb3f2635832
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing or to download further malicious content, aligning with a common attack pattern for PDF-based threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa987919b9f---64011245794.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/b615idiiv4oggo0viqjurdhdb0/90722129534.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/22032521460c2b76522847.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6f5d1c5482f02843a8f62580995b053e/susafabukomusojez.pdf
    • http://trans-serwis.com/userfiles/file/zoputiruvanizanegesuk.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42ff705d9---bavires.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af8f4b56c---wemexofixo.pdf
    • https://art-lamps-rali.eu/files/file/vasipirojubimokadokedop.pdf
    • http://crmloccitanecr.com/campannas/file/satiguvamitobod.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b4bdaa7d---meliranar.pdf
    • https://carlojans.com/cms/file/50135564657.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5c6a91188a2b25b8800c610c3e96bacf/34566572822.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6bad58ab12d60ef5d0037875acdbb876/japaxober.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ada903963---66540834812.pdf
    • http://khyljg.com/uploadfiles/files/bofubifobewusoje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chapter+13+genetic+engineering
    • 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_off0000e264.bin
19b0b034971575ebf2d03a81f84e5849874990b44d4cf7abaf1b37bada5d15c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 5104 bytes
font_01_sfnt_off0000f3c4.bin
1556e8ae0666c747423c3d621a28b26fc46689e4fc7450cf9a26409be92a3174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10320 bytes

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