Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8adfc0c457a1c0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 16:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd7b79f52082f0beeafb88279eb3caf6 SHA-1: 817a0454991a79fdb5a910705dbe9190770d41d1 SHA-256: 4b8adfc0c457a1c0941e9d55bbaeacb54fd002d6ac612e5e1028c8400f2e13fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting potentially harmful sites, likely as part of a phishing campaign or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=the+startup+owner%27s+manual+pdf PDF link annotation
    • http://pyramidplaster.com/file_media/file_image/file/sodejatatela.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mebofirubisi.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/gifunemuzeditulo.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/10663138528.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/86945314593.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/pafujor.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad89bb502---42442112216.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356263ee39e---9844368630.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf15d46b0---66392384882.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/87623402080.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/92116599257.pdfIn PDF document text
    • http://santeh.md/img/files/lowokotaraxivufoga.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369aa02a20f---40419150642.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/tetedagowevovuvopenesipa.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/kunadefod.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/3075197309.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/popolipef.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d599ee5f8c69ebaea36d61b6fc158201/69116615175.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/mipaf.pdfIn PDF document text
    • http://bjjiffy.com/upload/56590424694.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/81405641163.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c3cd0f52---suvepawaguturusofiv.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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10852 bytes
SHA-256: c2464274b5ef609740a4f01850f887b0c479dbd753a5811801445db3aada8013
font_02_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 17396 bytes
SHA-256: 4d5ed45134b92c353bfa73abaa9715db0a9f482a1ae483f0784950ea78aed090

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