Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c885a53be73bb6…

MALICIOUS

PDF

105.2 KB Created: 2021-06-24 04:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1b81478fd1708d6c696836b4b284ce44 SHA-1: f88e7a5e64517eab6a5632bd0cec0434a4ccf4eb SHA-256: 35c885a53be73bb61c956f3cc23eb1ecd4ddf206ba1627ef620db101e34603d0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host more PDF files, suggesting a multi-stage phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the true origin and purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9311

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://pistant.ru/uplcv?utm_term=gp+small+tent+manual PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fc148f8fdaf048d832380e966e4dea66/wapajuxejoxamo.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r2foskvdc2vlecf1ts18o08m4f/73654624066.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/10f211de135ce742d8d91417c9c7567f/27123251429.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/429735243.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jeremuvedoginufomurotuf.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/xuwigojupanowutapipej.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/45563678531.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d7f7d04c2---63446279583.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8ff21917---71032712229.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/puf1ida27oj5e0io3r8e996h5n/86372646345.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/5681749824.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6b957894---33139619961.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/211dd02e07b79871cac8a901de3e1c65/87025221219.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/sizodugufogikepixejepege.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dorajedinijopefej.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kawujo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/19cc8c279d723d3be3ee58fddaed370a/27241304970.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0anfedp37q0qfjarrk0iog6125/pekamefijuwugipiraxaka.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ff6e5f5632c6a6e757471ec02b3fd8ea/2231950819.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FB 4900 bytes
SHA-256: b7a5366bf7f10886bad83275fe8891f0880bcc3e8a712d9682ad37e437f80573
font_01_sfnt_off00017892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17892 12100 bytes
SHA-256: bfcb0e93e5a58c86ad42beb4f9ca0a58fd3da0e1a9d108c6bdbe7354d27519b6

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