Malicious PDF — malware analysis report

Static analysis result for SHA-256 248ab3567eacacb6…

MALICIOUS

PDF

70.3 KB Created: 2021-08-25 13:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19d412c30f10edf6200db9d559fbc15d SHA-1: 434434deac81162f51c925365941eec4212f0968 SHA-256: 248ab3567eacacb6eac1ced10f5350d6bc98b2157938d2e398a816033001e3c5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, often using UTM parameters to track clicks. The presence of 'cmdc9smbuj5/sivolexovi.pdf' in the document text suggests an attempt to execute commands or download further payloads, aligning with a phishing or malware distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9548

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://queure.ru/uplcv?utm_term=onenote+to+word PDF link annotation
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17f63ad9b---84329707770.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b27b9722b---56799370254.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2ab1qm49bsc3e7jcmdc9smbuj5/sivolexovi.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/fojepimesoluzavazemob.pdfIn PDF document text
    • http://abwessex.com/uploads/files/33201619198.pdfIn macro / runtime command snippet
    • http://huthamcauquanggiap.com/upload/files/wifekimok.pdfIn macro / runtime command snippet
    • https://studiovizia.com/webroot/img/content/files/koregobaziv.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/wodoxada.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/86337735207.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/90337715186.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acb293cf88c---gasisomolel.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/77208765156.pdfIn PDF document text
    • http://rhondachem.com/d/files/gurokuxezuxinomubibufix.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/sojalunejilekokonufasuri.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vinazisuvuvem.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16121b94f073b2---16347351559.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/faguzumemarire.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a5e7949b---misogev.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1543b3ef---20991147885.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/muzarevazim.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f94356907b38ab283387d3daad34006/fopuda.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2dca6737fe087dfd8a8d6fe7a4869390/zalatepewozevop.pdfIn PDF document text
    • http://hillandcunnreunion.com/cliIn macro / runtime command snippet
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 9884 bytes
SHA-256: 68a89594a74c8c4c93248740b0db5447a661e8c687d71f91a53e83347a40cd15
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1