Malicious PDF — malware analysis report

Static analysis result for SHA-256 698aeea2140030cb…

MALICIOUS

PDF

78.2 KB Created: 2021-08-12 22:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 368a0a72db8813e6bd5c37336b017d11 SHA-1: 13b738246c266cf16ac1a9dce059988491058881 SHA-256: 698aeea2140030cb2e0611184da12b0be93c6e98c566967c60bdf85ecd99446c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure suggests it is intended to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

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://ahcxdq.com/uploads/file/280057585265.pdf In PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a102c28d4ef---kotofeg.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/mokarorowi.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/15158950471.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/bamilelevapugazozobivit.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/1051968077.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a148a75c2a---20323948336.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/12758798154.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/4098105f8d82d2c8a445ed1764ed3183/29212238805.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/44222271435.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/turumarovupapefirelewijup.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed188d5bf---patawixunedexarunewutut.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/tolosesamiv.pdfIn PDF document text
    • http://erictex.com/ufiles/files/ditinokemabotokure.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/35210761049.pdfIn PDF document text
    • http://normel.org/files/upload/file/92607303360.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/13471267930.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/pekobujazezu.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/gofimu.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/80992025679.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdccdf12a0---28234641266.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62ee47cea---50370503926.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/959hvmd681s9os7o0o8i2jot5e/173360718.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/44125896770.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/xejukilesuxegiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+retrieve+old+text+messages+androidPDF link annotation
    • 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_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 17128 bytes
SHA-256: 9a19f8954d6a6d1b0108998a78997390500ab3b8f6a21590b463adc2033e8622

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