Malicious PDF — malware analysis report

Static analysis result for SHA-256 666086a8a3038450…

MALICIOUS

PDF

64.0 KB Created: 2021-09-26 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef0de1b9805ff22de33011fa90b67ad8 SHA-1: 9e6b39bd29256c3bf5fdc0330496d3af793d6f4e SHA-256: 666086a8a303845079eda28725f68cb3b188d241ae416a8e3bb0fbd5aad28a85
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The heuristic firings indicate a phishing attempt disguised as a download link for a Windows loader. Although no scripts were explicitly extracted, the nature of the links and the ClamAV detection suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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 http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/tatuzik.pdf In PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/jaderabo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140223ae7266---71396068096.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/54720309197.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/luruxakibufenuxave.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/72208893675.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igabizoseso.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/tulepexawudajafenas.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/63185642384.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613382b7da072---remelezazusegilodewuja.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12794044889.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zavokabudozogal.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/uk525qtmip1ebd97g1f7em22ka/50849376410.pdfIn PDF document text
    • https://archicakedesign.com/upload/file/47792901833.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f59f68b20c---66159110795.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/43775971095.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/63558303450.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/47741301950.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/farokufiburezop.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/funafofisodavukaluzedoz.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kipozinisil.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/54739759901.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/pisovaperozux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+windows+loader+win+7+32+bitPDF link annotation
    • 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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 14924 bytes
SHA-256: 6145e36d2dc74c25c47c052adfb818d4d776b37cc42d180240383009b3c38fe6

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