Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76280c38345c32d…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 20:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac354c2b2192f066d60c088ed29e917 SHA-1: a4b326fae0543e027a7a9ca47ab746ec71326d3d SHA-256: e76280c38345c32dde2e7531d4386f00d05bd0e6399e657a7caf88b8f4d5ff54
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://drafthe.ru/uplcv?utm_term=i+wish+you+would+come+back+taylor+swift
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d436573d4e---jugaxavomojibaxobison.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b302d1e9d2a---pejijawejolanenesuguxir.pdf
    • https://ncsccalgary.com/userfiles/files/96556690966.pdf
    • http://studionegro.net/userfiles/files/fuvuvawikali.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076365db1234---luzemixo.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122462a3e0---tadasilot.pdf
    • https://anthonygillant.com/userfiles/file/61826684508.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5de982173---fitoxatimokakovexelitaf.pdf
    • http://bhttourist.com/upload/fckimagesfile/93015163344.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1a4457cf75ea11cf7e5aac92d2a0a151/jidamubagididifo.pdf
    • https://namratalakhotia.com/userfiles/files/40943738869.pdf
    • http://cs-golfclub.com/ckupload/files/rareg.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad981e9131e---powawixagar.pdf
    • http://domplus.su/userfiles/files/63948063926.pdf
    • http://brnc85.com/clients/878796/File/74917174506.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbf183769d9a95198d3b2930c37adb89/35202002703.pdf
    • http://navigator-nsk.ru/userfiles/file/nesokivewefe.pdf
    • http://crosswaysrecruitment.com/userfiles/file/zorozulukodemaporivano.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af3bc3f7b---javagerosogeberatomedu.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f644e364ca---34090384367.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ab63f425---powipusas.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a6cbcej8iajcgpti5t3pida3q6/seramadurati.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bc.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 16160 bytes
font_01_sfnt_off0000ee36.bin
179fed4ac9f1de708addc5ea47c77788dae91cc17db95da14bba834cd20e86d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 11120 bytes
font_02_sfnt_off00010842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 16792 bytes
font_03_sfnt_off00012054.bin
298f775ce330500055b32f381b1e59a8b0dd55663cbee88efd6a9bdcbcf297c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16472 bytes