Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f74c0c204e8f290…

MALICIOUS

PDF

89.8 KB Created: 2021-07-30 01:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71d52d7a0768b0ae680df84c54d0fd13 SHA-1: fe9e6afcaf3524e8498e506e08a0e7a94558971d SHA-256: 2f74c0c204e8f290c5962888e9c5f747ad449e485566062c513344c521cbd500
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to other PDFs hosted on compromised CMS uploads and disposable domains, a common tactic in phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack where a password is provided to decrypt a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/sps0bn476gun9863tl31i6q60e/finisisepazu.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ad73f7a85bcb62aab09c66e7042ddc24/toxiwudamajuxozeligakul.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/gijokanadefokesoti.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/83136165379.pdf
    • https://damiel.eu/userfiles/file/juperojodixuwimobikomomip.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/29277782c63fad329ad0132fa02c0731/31146265801.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bezowenuteba.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3eb54a721c3302f5498334a2ff466b28/5276070025.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210619_7A220EAFA3386FA2.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oieno1vbl5m0t20ps680e2a2a6/varibikukejasasezopateted.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a63363852dfa6dcd9df389921acbac53/risexilogebevumivodajap.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d05c13b96---66024376887.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a2ca1a091---vamujojebusewojomevasavum.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fuqrgg3gvrcdkq1t2m0s36omn1/77860986993.pdf
    • http://momsystem.ru/public/file/9530381960.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/gulufibeduga.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d7b5e32e3a23c27f5e320007c631ef42/87041892938.pdf
    • http://alexandraharris.com/clients/36054/File/bokuzufawek.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/031553073917.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6eecdf128---60137862188.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6832644ff---gagadopadu.pdf
    • http://metapolar.hu/tmp/89136523347.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/64c70fe191d57177876c04be176906ec/labifigak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=assinar+documento+pdf+com+certificado+digital+gratis
    • 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_off0000f6f3.bin
da8684c97d41cad3bd3fb23509d386ce53d40ea109903c8066a9423211b00a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 11044 bytes
font_01_sfnt_off00011072.bin
d964c1beae7c88cf9f318106251b9947015201115a9668d86a711e6b27c58afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 18548 bytes
font_02_sfnt_off00013dfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFE 16792 bytes

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