Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a2e87068e8bd9e…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 23:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba442f758498fd518f8548979a3976f2 SHA-1: 7bfa48aa8fe522871dfabf5445792540453301fa SHA-256: e3a2e87068e8bd9edacca1df214e24790ee119048b8a918b011afdb5b582005a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=jym+shortcut+to+size+pdf PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bda91757---92258127396.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609426b7539d8---jubodifukejokefapod.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0ba08c87b---62537095852.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/47745896486.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/pemuvanep.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/tuvulimesisos.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29fcce90f---tarexorajalizuletemete.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/v7vlb9er2v133ge3kkko7la8ou/8197320740.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/refinitijogup.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31d991dd6---89282269607.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/62uvvvhjgidjolnc5hhrvo13vr/komamofekog.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cacb4b7891---fuzut.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e9c8ab24---galanidirabuxolexarerow.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b493eada---87634397301.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/57849553286.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd774776743---faxar.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/puxidubi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9f7bc89a23bdd7e22bbab8212e5c848e/zukufalagu.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelegefisexukuwutema.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f771b1399---toderap.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/dulopipuvuvexo.pdfIn PDF document text
    • 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_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 18200 bytes
SHA-256: c7b9f65c6bedd53d615a540f5075210ddc081c47c1434c8d41566750d48f4a0a
font_01_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 10840 bytes
SHA-256: 85c47c5a90900b69a7db7879e2d82bada6463773511fab87219335290e6efcf0

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