Malicious PDF — malware analysis report

Static analysis result for SHA-256 79256da52820b5f4…

MALICIOUS

PDF

98.7 KB Created: 2021-07-14 03:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd576e75f789cd0b426ee20630fca1b3 SHA-1: fc89909c9a4b0076661981b1cda57fe558a1d21a SHA-256: 79256da52820b5f4257f7a466fa9ac0c9891135afe3cea8416dcf8c9b33c3fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pistant.ru/uplcv?utm_term=how+to+export+video+as+mp4+in+davinci+resolve PDF link annotation
    • https://tomas-music.com/contents//files/52510720656.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091666ac07a4---bezupanazeger.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501101155407205057.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/67055772768.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b517d8839---befaxirigiriguxavetej.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/dososimifafare.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wupudofidituvosukimupixen.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fr8bqstfbp6hocj3ntfkhpco53/dibusufepevewaxowol.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/zalesedefat.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t1e35bg5kff65u8koa6nisoa43/zisoliwulape.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210703044214.pdfIn PDF document text
    • http://runo34.ru/attachments/file/wabepimalaselimuwukepoji.pdfIn PDF document text
    • http://cichanski.com/Upload/file/52735820203.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/58ef6da84b198502b568f848938ac7e1/41523011761.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/35171447957.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcsucb3lf1amihsqo8cpsahtg7/61361331433.pdfIn PDF document text
    • https://brs.jo/userfiles/files/94862468811.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160781d049dc06---sugixoruneno.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/29130016262.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd65a038---38930130977.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6877447248---61992773760.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/puxejuxitapalefito.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160869ef019aff---8333650861.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b39beeea9---63990621698.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cd1b98e8e6f6652f8c4831832c04dc8d/46893586770.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_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 11000 bytes
SHA-256: c451effe44dc6ca1d868e665b3ff1857225fc56080926ee5f4c4fbad6091d5b4
font_01_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 18160 bytes
SHA-256: 72c1ef6c9adf4f95f249f86d998604d19ad84bd4cba1ccf1912ca82e68bbea58
font_02_sfnt_off00016506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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