Malicious PDF — malware analysis report

Static analysis result for SHA-256 b260ad3fe7b47f29…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 06:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bada206a1b9df13e7bc7fbcd51be0bc SHA-1: 8070c292309222885fbd71e704395e6b4696b2d2 SHA-256: b260ad3fe7b47f29a780782081a11c04c0464c0faa94914c7ba12b58b5830cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous external links to potentially compromised domains supports the phishing/malware lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dm8idmfklvidfummo0jsl8n17o/taveweributab.pdf In PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/615899c65596502c5c3050152bced80a/rerevarorekudijunuliri.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/41312d836baa58a61c98ac30e877e0ee/24816599747.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/61587545597.pdfIn PDF document text
    • http://446888.top/userfiles/file/mogixikuzomijibuzivesunib.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/64339486556.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174555e225---vidadavipukelisoweb.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6de0d8d1d---mekukoxosozekomexufajev.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zaxumi.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/13664838103.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuae6lhanker0ded15g4sjbio4/zewewo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e578b794b1---89089322374.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a512023a1e5---liwekatowake.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f1f273bc08578fe88b2ef4ec42ac9247/81005955468.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/danoxipoj.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/susunosowaxir.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1e90efd6a5dd50af9e006a6b7cbd6163/502502772.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tosunovadotu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f514b7970---loxogarexalilituduvam.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052805070370554.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4tok1tgj81oor9a7qpnci481t7/pagemozetalitevejujadis.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/q6v0uuig8ssjs3jqj90kncq637/fenipot.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/2715527065.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f8e98e91---98768832913.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/gusalidikexerexow.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/brsm38k5eg1i0h2aljg567usrb/tivomakuvejiduligusesube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+ct+angio+runoffPDF link annotation
    • 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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 17996 bytes
SHA-256: 7c2a67eee17364f19b051802608c0f97bede6f625ad1fa2070125f8831b6a28f
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 10528 bytes
SHA-256: 817ac3e0e2812ebf9901d7b67b0be864f34c65f3829a382072eb4495b24d7f09

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