Malicious PDF — malware analysis report

Static analysis result for SHA-256 012799d32f7d36c5…

MALICIOUS

PDF

93.8 KB Created: 2021-08-12 19:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58d92a59dc84b8fedbd67512297cfb05 SHA-1: 65095642b288e878d8e0cc5ed673167a2f4a04d1 SHA-256: 012799d32f7d36c5e5bc9bdd92c9d60c2b2e4f117a3df3546fc79497d6a4b0e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. The presence of multiple external URIs and the ML detection strongly suggest an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://zamokugrofa.sk/admin/fckeditor/file/ziwonanuvu.pdf In PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/47875913646.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d69fa6f7c---52797967498.pdfIn PDF document text
    • https://cecprint.com/images/file/nuzomedigukisa.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7uv5j1mi9ksjd1c2tj12r5ugr5/79256482301.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8d583dad---49886111718.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823235a9ba9---rolobexi.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/17178159156.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1565af87a1a3c055f3ea4d4d557ed580/90953403477.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9e38e3435f92a290354f4fabceb7c16e/gufun.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9kpgtopmb1689ouv3terd12fh3/23929657879.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dovajikuximodopovekajiro.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/lokapanawipi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/19c74858f85d634034ab5ecc0e23fb7b/18245072864.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/gujidegisokawukuninul.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tisixuboluritijo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69a00d7ab---lawegawil.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/mudaxemijijugovozaxadinad.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/17785085036.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b3f6dbc3---musukonofevifukikije.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1628251784.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712728adfb4---1755214809.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/javexotuzefatilezojuk.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/kajolelarelivigunupizego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+did+globalization+affect+africaPDF 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_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 17444 bytes
SHA-256: db832e76b5ecd079f7854bc942065a476ffcb16ad681b0882c0141124dc50942
font_01_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 10760 bytes
SHA-256: 276846eb31c74aad69a4df61e3a325bb5171c5d729be0dd4b709cdb509f74813
font_02_sfnt_off00015020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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