Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa606afbf022bf9…

MALICIOUS

PDF

90.3 KB Created: 2021-07-19 01:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e10bc89916927b7bdfd07aa94afc7c8 SHA-1: 22391dca4cc6b3af0c5effac362073c3bacde144 SHA-256: 6aa606afbf022bf9986b317650575c018d3bcff657f544087d141f0d860debc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://j-line.ca/fck_upload/file/18883500487.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c59326a8---38087796803.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/d1fdd1a94cac8bba13c2e99dc518c537/jogop.pdf
    • http://southport1969.com/clients/861680/File/zinotut.pdf
    • https://bda.ch/ckfinder/userfiles/files/99023120582.pdf
    • http://lesen-und-schenken.de/userfiles/files/xedeberovipinixof.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc78e9864d---gudurig.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a6905d98---pozaru.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/k76nhchc1vq7osvs4uuuutdhsp/65557315060.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5fbeda8c4f1749e06fdb022f2ada4c45/kemalikuluwapefirilalepu.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f74d8b9dd---92067952179.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae6c9549d---relifuxajikuvuvoxen.pdf
    • http://langmypham.com/luutru/files/94824031688.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e171b8db2---lofibefotumomilunevikika.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b7f3d5b7---fevitinawa.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5428494d---kupobak.pdf
    • https://fanaf.com/article_ressources/file/safowijokotokosalogexiga.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1010882e9---28769969411.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc23826ce0---85748882684.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5ea990c8926fb1de9753ea88b2700428/87985261125.pdf
    • http://anm-av.de/uploads/files/pelonetuboxapazifosiwer.pdf
    • http://bajajsports.com/userfiles/file/nozowoxedoge.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38140011119.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1a516198cf9d7e360d763cf182fd1cd/47969197667.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kelanerelafapanowenemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+suck+your+duck
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 16792 bytes
font_01_sfnt_off000113ba.bin
72d224c007c50ca2f2819576f38523efa63dd54498587a2f3ea76127af5fd056
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 18136 bytes
font_02_sfnt_off00014387.bin
8cb7c757499afb20cbfc41e57209e08e5f286447ebfe558afefd4429c454d6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 10208 bytes