Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33b351b08b21313…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 19:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa5d226f894f1851f7ecb4e03b1d89c7 SHA-1: c38ffcb8b528b511fe60c2fd8a8c98a54486bfab SHA-256: e33b351b08b21313abbe48b3710a66bfbff620b162c96982e99042737e6da823
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary purpose appears to be facilitating phishing or malware distribution through these external links.

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://catamma.ru/uplcv?utm_term=rdbms+sql+queries+pdf PDF link annotation
    • http://kxnjl.com/userfiles/files/82209430167.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/pojewejibidobabevitiz.pdfIn PDF document text
    • https://nomortiga.com/contents//files/sivodebemunodutopegij.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dd7f1a71---31136368767.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021722162111761.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c1ba3d14655a03314105b422fc80b1c8/46917611286.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/51373015971.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/49248083944.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/44184631480.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb40b7f1fa---17746872351.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/6392566478.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/perigudelonagisimisusi.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/95698891136.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d31d0ffc378acf2987f9beb6e614b0e1/73873331218.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/ximebisobizezifedamak.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/86880861535.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5c1e6aabb---mosateloxup.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gituzofofi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210707210423.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df9839a0436---57094717923.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/682bef1edb6badb213f8138d986ce890/gipebaduv.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/xinilujaj.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1j96vqpjhuvq25rd81shab6hib/68415520818.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/nevujarizadalujemupu.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/58537374547.pdfIn PDF document text
    • 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_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 17556 bytes
SHA-256: 0a3f81a1022aba3cfee031194ba39019bdb1245c2cddf1755b5259403e5984a4
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10604 bytes
SHA-256: fd7264f74441de05c9f8584e17fd016fdb12348fbf3ac388ac2b0e74e6232bce
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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