Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be7955640102df9…

MALICIOUS

PDF

74.0 KB Created: 2021-06-09 12:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 336dc47aa36f87196abe86a3386d63fe SHA-1: b17409813ac7221dc987a35d076b03f53cab8ed3 SHA-256: 4be7955640102df9d62ef37053e739ca69c9ed06ae503f1923581b7f176ccc20
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript T1553.005 Security Software Tampering

This PDF document is classified as malicious, exhibiting characteristics of a phishing and malware distribution lure. It contains multiple links pointing to compromised WordPress sites and disposable hosting, likely serving as a link farm for malicious content. The document also includes an instruction to disable security software, a common tactic to facilitate malware execution. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=how+to+get+minecraft+win+10+edition+for+free PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e45ig3s4tvbcaf6c6i582924rc/35946789129.pdfIn PDF document text
    • https://invest.pl/userfiles/file/fogukegejipetif.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b941dd1259e8b8050f0d678d65bac195/zabokusozoruxuxato.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/49832076906.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/ragikoladi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c77039f23---pivesetebaserobak.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b52b1cb1c---7787132914.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/54df05ea2db66e1e4504de47bef53184/ribadarirajute.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0b5c45c6---zabuzibagivovibenup.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5af5cd06a---21242074154.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xuwisumo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d6cb1adb---29548669797.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/62ac8f6d56aa79f48681d7c862e8c7bc/widobanij.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/zajewozexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 5380 bytes
SHA-256: 955569b7186f53fd880bb955e836740956a4eecaf267261cd8c0149eb590d038
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 12788 bytes
SHA-256: ae1ee62aca6450d4f5fa31b94739dba5db303262ae15cc085b57982c57089b2c

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