Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cd4c2bf0b94798…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 00:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd3877b24bab590f322b677f7a4cc08f SHA-1: b969a9084a0370dcd6642de1cba88fdbc92dcb1a SHA-256: 68cd4c2bf0b94798bc04ee6bdf44c80cd9e2938ffd9d226d18af8b1c0c4bd135
156 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 or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. The primary attack pattern is likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://fontaine-eva.fr/userfiles/files/43762016157.pdf In PDF document text
    • https://12shio3.com/contents/files/tijosaxafim.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/40637067448.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/21964489407.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/98609358710.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316e6d6353---27117229025.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/52318520293.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/kepipepelekoxagobipirota.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/948297271.pdfIn PDF document text
    • https://actor-conseil.com/files/file/disedujepapivategaka.pdfIn PDF document text
    • https://chptravel.ir/data/file/kijekasadomebudip.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/buwiwiluvituzevaze.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/gazodasajuxoxobeni.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/vuposinebiti.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/womimiwepir.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd9152ab76---pipuso.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320eb7b62ae---kikisusomifirukegilemi.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fivexipopozidapiv.pdfIn PDF document text
    • http://nktrading.qa/file/files/sowedorobavanutevawufebe.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/sejadumuwobe.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613e998e7a775.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jowekuxuginalekogotu.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/91843082533.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/62610851405.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3c8d834a61a245f3c7daaca214e5da95/32055650326.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/kovawipatuxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wachet+auf+piano+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 10496 bytes
SHA-256: bb76f277aa960c63894be1f59983bfd1d1a74aff009e24a03a903665daaceacf
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 20788 bytes
SHA-256: 5fc5a4ea30c23fa2bd29acedd36542d13f69a4377b2d10ed5123fadf1d722529

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