Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc702bc5a88fad9…

MALICIOUS

PDF

55.0 KB Created: 2021-10-01 04:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08a9fa19a27e1be8dd7c0588aaac7162 SHA-1: 2eccdd24e55dd3c786184618fa27a05d624f13fa SHA-256: dfc702bc5a88fad901cbf9b3bd3735deecc07b8e6d5293347a3f90d3eaa53c4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a PDF_URI heuristic and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent. ClamAV detection as Pdf.Phishing.Trojan further confirms this, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

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://krisoc.ru/uplcv?utm_term=download+termux+hacker PDF link annotation
    • http://byty-pardubice.eu/UserFiles/File/90924118314.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae405b86df---24189415923.pdfIn PDF document text
    • http://elsped.hu/files/file/vikefik.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/papejijujeratuk.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614538f3c448d---torogilifan.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210927071559_0035xe.pdfIn PDF document text
    • http://retailcop.ca/files/65077982803.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/60016110852.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/7236465591.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/sasazejufirimuno.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/47265097795.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/9242709300.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/xedexemejeto.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c374e51348---1055393798.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/demanisuge.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/37733490806.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/89632761289.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109231556042831.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8232889505.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7783734687.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109171805055353.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/sixitala.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dizowusafep.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/gosipakadu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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