Malicious PDF — malware analysis report

Static analysis result for SHA-256 7098908bd83342b7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 18:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37faf827155ecbcf748222145c629048 SHA-1: 8464a6bf4e08bc0ef7109a84c1548076a6dbdce5 SHA-256: 7098908bd83342b7e15ca485f2f8466ca47fb472a3c64484cb21002afa0cd819
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 Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=physical+activity+questionnaire+for+college+students+pdf PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6f86257ae4c410600b7ebfe40057c156/menazigomofeno.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/74160372723.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/nofiwogisofitiwa.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d327fa4287d49d8d73bed3bd38bc24a9/wejugurugalosugavi.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/sexugisipujimeseromidi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/06bad701647d5528feb8204b70e4f70a/sitorenibakisolejoden.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc27b16f6eb19c50a78bfa9072c0192e/13183070822.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/dtunjbpioumq7er4mip7rtc0kg/91558275103.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/kedevanasifujujokegotiw.pdfIn PDF document text
    • http://sun-tes.ru/files/file/10379629710.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rpd0pb4tqjldpqe06l42lo1jt4/memelaw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e928313189f18f81eea6ee327bd0fd3a/45858927531.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gevotiginapefimenure.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160835f23b68cf---74694963895.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/zabefaporenifetosoxalolew.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/warololatawevuvikuxutodof.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/52754362077.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794315ee32---paxufaneniwurububalalujo.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/12107430640.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/taraxezuvuwube.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/89885419223.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/510aa9ff74597afb0da50d4efc70e884/35092057742.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/58ad18e89e9b72bfc93403248a8a2899/49099000165.pdfIn PDF document text
    • http://ecole.ru/text/images/file/numobipisedif.pdfIn PDF document text
    • http://sam-global.info/files/file/nubesekofin.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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 11328 bytes
SHA-256: 3eee8e3d4cb69a54ebaccfc3e6ac65633c236338d8a40b96c4e4d90faf5ae8c1
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 15504 bytes
SHA-256: ff05703b7b0b7ef6d6067eb4511467711af798fbca442a93188c4f5c71ee95cf

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