Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf1f578c4981394…

MALICIOUS

PDF

97.0 KB Created: 2021-06-25 16:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f69c312db05b636784bca38bc0dbbb5 SHA-1: fd611843c165b28b4a0b9de095f070c32c4dbe3a SHA-256: 4cf1f578c4981394d75db76d342255cc2d472155355843570f1ad0d81ca21546
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to potentially compromised websites, suggesting it is part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were directly extracted, the overall structure and heuristics point to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://soudurelausiere.ca/upload/editor/file/lesifutamelubezuga.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lfqqg4ul7r3q72c65r24pvn437/17307021401.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4730651c---32344499774.pdf
    • http://azseal.net/uploads/userfiles/file/kikepikazatezet.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/jedojipe.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1193d3ae---mimominefuravu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6ee88372fef0193eccb30d90286591b9/73177422161.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5705d826df---66525579856.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4mtobc1eb21dl9pt459ub7ldlh/11230666871.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/da93dbb05dc3b1cb3bead8dd3a5d86ba/vagawajiweje.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a584101aa---5009795556.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85be1c9ce---kotobanakimanudalan.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078916dde801---72388789241.pdf
    • http://sunrui-ti.com/d/files/wovufaripeboradefetejijet.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af258e1f00b---mimugidefezorip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=class+10+science+chapter+1+question+paper
    • 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_off000100de.bin
21a0b9a82372a8959e451c437710111a612ee7e1a0aab6dc253a3b40b8c6b320
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10920 bytes
font_01_sfnt_off00011a1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16792 bytes
font_02_sfnt_off00013230.bin
301fbd9ad847e9181d7d561dbb52933d4694cda8a7c6605091d22814cfac0c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 18072 bytes
font_03_sfnt_off00016167.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16167 16092 bytes