Malicious PDF — malware analysis report

Static analysis result for SHA-256 974dba89d1a9c3fd…

MALICIOUS

PDF

80.8 KB Created: 2021-08-28 23:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 176a23bcc09eb7c509b7f0ba9ae7b6f7 SHA-1: 1dc062019de527f674e860db86d23d2da68aa5ab SHA-256: 974dba89d1a9c3fdf3b170bb8d9bb7183b668e3204c8b3d7225c2f27a06494b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous links hosted on various domains, including those identified as compromised CMS uploads, strongly suggests an intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://metabolit-plus.ru/files/file/69648115349.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48fc564f---65808427234.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///falejugakanozaluf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6090082a---58697642782.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf09cbbf256---23140789838.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/39559693702.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/remetikatibowazi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7363b192deb515f141c14616d566dd1e/80065791408.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8897dab7b7---bonorojideponajonon.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/pedexusozufozojumedikag.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/petanorejiputizowojog.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/48445981773.pdfIn PDF document text
    • http://novichiha.ru/pic/file/pipaweri.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lomamakemanusew.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/55697605560.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kexememoludepebaxubol.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/lupimawepojibeligapuxali.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/roxukixapemalibumi.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xewejusifiromepebonag.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/60094464006.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ced4d11---89466557799.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5afe2f7i9drdb3e6ntndinktn1/11455151742.pdfIn PDF document text
    • http://4bx.pl/public/file/52379712853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=side+effects+of+black+seed+oil+benefitsPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10676 bytes
SHA-256: 99f8a5b75100da0159d81da712546b9572c40cf2f4336686e473b5ecef4e8a7a
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16972 bytes
SHA-256: 10509d3d9c3b13b621d2a61c0434989e04013db7f5823e38d74923c0cce8eb41
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1