Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b356b2f44d5f14…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 16:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0750cbd36f1d49e973369c286397b3ff SHA-1: 3323d9f16806883430ed6c32c28666e9a7ce0fab SHA-256: a7b356b2f44d5f1428159b073409fa7da6d13ffc6da6c47b73a75702d4f17100
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns suggest an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pleasanton.com/wysiwygfiles/file/9522446017.pdf In PDF document text
    • https://posh.hr/files/suvesoterima.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346ce0ed72e---70671678003.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/36631767386.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/29121414683.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a54cacf---27428534982.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/sisoreserajuruvejufas.pdfIn PDF document text
    • http://gibisch.com/files/files/zidedavufejanun.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/tebalureda.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109090229252642.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/88461338444.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/tepiwowaxoboto.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109081311184403.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/46891324855.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/63737386167.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/xekirisaxizeneked.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/79401676605.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/59237574733.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/buxut.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12886486074.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/19091523712.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aa6faf31f442e4cda4b48728e755f2c9/64455007083.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/jowelida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+red+ball+4+apkPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/26701805697.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 17564 bytes
SHA-256: a321c11df3ece48d5cd1506983f8eec88341deecb014fa8177809730e81e2b58
font_01_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 10424 bytes
SHA-256: f54df7ba75d8d70afbee5776250f2247f3897d42f819b1ee0993e658fd0f7ff8

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