Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44c1d10c4d9aad0…

MALICIOUS

PDF

59.6 KB Created: 2021-09-26 14:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cac79ac808cfdf05843d4f47a0a830b SHA-1: fb8c24f2a963bf75f75d33a9f82373c6158bd3ba SHA-256: f44c1d10c4d9aad0f99733905b5b86e8c4b3140e03a0b0bc72cfc898543d47e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a mix of compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7246

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=ppsspp+iron+man+2 PDF link annotation
    • http://sarkanyhajo.hu/files/file/39322698096.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614629aa79452---25325810098.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/furamumaxe.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/60052425077.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109151108479538.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/tatozaxudud.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146385168103---ponugabinevumevixelameg.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/molufu.pdfIn PDF document text
    • http://alltechsro.cz/files/14083343996.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/50730551919.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109171215174015.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/newobininamemupide.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/bepibirerakuxu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/jowebadiseborefetinev.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/81276940124.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xopisiruf.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/wuxasezirifulimaxe.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/nujol.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d31bececbf7d1cb3d2e64b7ae2b12aba/zugegugejazadabebonu.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/pixovezulijewukesumopopaw.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/situworonoxosajugesa.pdfIn PDF document text
    • 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_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 16124 bytes
SHA-256: 324f20dc00d84485ce5934b92551a6e8526905cf31fcf6b88902f58e34fd59da
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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