Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df4bbb55248772d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 10:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e29aab0535864b66fc737b1274af5c06 SHA-1: 1923c9749cfa5f1ed5c6956da17d8a9ca06c550c SHA-256: 2df4bbb55248772de0d49c22b66474251544eddb1c73216bac01286d9fb8943b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to external resources, with several hosted on compromised CMS upload directories. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kipass.fr/userfiles/file/gakos.pdf In PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/boxiwutadofot.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/kesejejarupevafeviperajig.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/97436563929.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/karodubotefo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132b80ded1bc---vepibebuzilaxexagowitudu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/golurirarike.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614015eac3fd3---85386333791.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/32135803849.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/9313859493.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/7958208261.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/wigopupawatujoxilef.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/woxinenizadune.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16de53086---pagudafigu.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/10136060911.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/41453697680.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tosite.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7d2390331195b2b56b0b3ee7d9226d54/34082457272.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/200746bf1afe8374547363947bddf170/87914204060.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f68bc4c0a---29172021438.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/zobidetirojo.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/57359417061.pdfIn PDF document text
    • https://ferropula.hr/files/52663829574.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ueurn0qj74df15pkm91pdu2s3/47157123050.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908144710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=luca+123+full+moviePDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10496 bytes
SHA-256: f5e66265d624b4f0ff96c924068e265172d3c527e5d102551f270b46d9b5d738
font_02_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 18460 bytes
SHA-256: fc93db21e15b2a6b53d3eca088fe0a0e499775e3bcadb4265bd801e5f05c6738

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