Malicious PDF — malware analysis report

Static analysis result for SHA-256 7863db8e4fece3e1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 23:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 410d3b6d8f7436de39413c0920f9b168 SHA-1: d1e58705e6454f1afbd9d0628b406a5d831b3eb2 SHA-256: 7863db8e4fece3e1d5a3f7bc742acd0271e5259999e9e76b6aefb895c4e2238a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=composable+infrastructure+for+dummies+pdf PDF link annotation
    • http://bbfrontedelmare.com/userfiles/files/tifafem.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ffd8fb6cb0b0f0956392d7f2752117bc/tixufules.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/2697438861.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/32077394641.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077469349331---pavine.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/279583b7121d25ad2b62b71d22e67c9b/95894934976.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/zaxomelexobedu.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/518022d2d530195bf73cce55a7a405de/36257078149.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/10270896998.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/sekexuxaxat.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/67bc16a7e72fc94ebba2aa10c5639605/wavidagawinaloriwufetes.pdfIn PDF document text
    • http://seritour.com/rsm/files/85956487939.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b277dd8a08c74c9ad44f23ace75a933e/85701752613.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820f36ba3b3---12432258174.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/fuvilule.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/nexajobirire.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a0004e55dc63e3b176b2517b8fec2245/33642956847.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe944c4047---99882440435.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/760b69d3960bf4b83f03a1cc1979ddf2/wufijasan.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/95399967948.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ac153f15---20868665217.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/88950165846.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/difudenobisevibaxufunuka.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/75251159625.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814eed9360---kalibagiretesaxonitukupis.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/19613585647.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/42145142722.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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17200 bytes
SHA-256: 9ab1bff927a2c37185a5110d2e0fdebe21584c39ca06350f22298402ada32e7e
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 11052 bytes
SHA-256: c8d49ad8eb5805ed58605fc08d7c0ef565b0f7ff00fb6f3a9d4126c895e283ee

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