Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ef4a12b9cbe357…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 15:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53cd847eb819a60504bd5a1863277689 SHA-1: eff83425626d24d917d716ff499655a93fc579cc SHA-256: d2ef4a12b9cbe35796150870414b74cb54bab56f0e6138eaaf3cd7b75d6d5b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites, which in turn host the malicious PDF. This suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b283574288a474a72826518d3569fbe7/fusawakumoxifemagone.pdf In PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/16932548238.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd2075dde---nomilavizol.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/65906531158.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/95899699298.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/81311544629.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/60902395807.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb080d0c95---19023756757.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/mewisovawuzuzogevuwo.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/fawizapebuno.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/sedatapugunegikiga.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/kizupaxena.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aa907ae9383fba2b74a37836b1843053/dedeneli.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9039266341---91509212815.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/54620102411.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ne8gbbq5u02j2qgc5dfpaq6rs2/54936084624.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/47708cbbf66db46f12a85da1f431939e/vijiwimos.pdfIn PDF document text
    • http://simonide.org/userfiles/file/75446324021.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///30250012105.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/85680433943.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d545b83726---64444463740.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16118d928e429d---lezikuzifivananuf.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6bdee1697458c9f1cff0b0740c3ad8a2/46332294186.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zimegowarotob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=canon+rebel+t6+manual+mode+settingsPDF 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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 11032 bytes
SHA-256: 69ee8c0847675fd2aee159be700eccdd7958d681f2e1cc8c77bcc6e8921e4162
font_02_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 17960 bytes
SHA-256: 7912e997f59d8edeae92fa334a2a99aaef2b3659ac44308816db8b184e888c38

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