Malicious PDF — malware analysis report

Static analysis result for SHA-256 9004b294b9929d8e…

MALICIOUS

PDF

78.7 KB Created: 2021-07-01 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 84c615ec4b29613926afd028a93ad7c4 SHA-1: b0c968711d6dfccb996ba1584291654f45b6a6b4 SHA-256: 9004b294b9929d8e6d3121dbb1b305a36be42e508d0ecca2c29a75e8b77539b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and embedded links pointing to compromised WordPress sites and other disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the exploitation of PDF vulnerabilities or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=cysts+behind+both+ears PDF link annotation
    • http://anbao.vn/uploads/userfiles/file/45374775124.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/auf8vedplb8m1r9lendgth09n4/voxitepaxukelinonebavo.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/govikibeni.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c5442a37---subuvixusedaxoledatixofu.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/5111888954.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/66376058139.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/rarivukexisul.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/555f9be6ec8062807c2025233855668b/sorugufav.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1b88d725c925a31fe8361667c8bc770c/21616745272.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/44158985352.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4334c6a02---15382322605.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/83745039857.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/35644553709.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aff863e90---70868698429.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/ketobofefoxoz.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/xelelulasunimotujazorimib.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/57472469007.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqheqmktlk437a5femfi03ua01/84133340803.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/43565394984.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/93087481984.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5306feec---fizesufezadebigeritodiw.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_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 16512 bytes
SHA-256: b3ed98b1610355bfb886a920ce8d8655d21a47c3d8a23819b1c38703d4f9ec08
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10584 bytes
SHA-256: db55a142d213155c7e61167b05b9b8ea25e47006b93ef3cf432fefbfd95eab2f
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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