Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc6aa2d2e0b90fb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 03:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26809054b42bd545a43ac38e6a8e09a7 SHA-1: bb9e66f2c8abe932b190a1d804d3941b3f29fcc3 SHA-256: 9bc6aa2d2e0b90fb2baa99395ffe50ba7c63316166efc5f89be55b87dbd12a9a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://a-swiss.com/upload/userfiles/file/97302894464.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fffdab7f9d---renapasaleledurasobazamiw.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/veretox.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/40896690588.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/gapokolesanime.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a5eb7acc74c9f1867cb876c0da91892c/33598541542.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/14ea0373c01c1a3362eda7413f3e3aed/sumasotapug.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6618b3fdd---durakoviwebujon.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607381b91ec14---nonikelexorozubi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/525l6qdghbqi31q6mb2b6o4q1g/84582669111.pdfIn PDF document text
    • http://dd-eng.com/files/files/62107248824.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/p2o7coj70him6eqpkauao106cf/62585601014.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/38061373461.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16126fba2aeed8---6111187011.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/baduniketu.pdfIn PDF document text
    • http://dimexautomarket.sk/ckfinder/userfiles/files/68189516758.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/73342777411.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vadujiropavikemorotix.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/juzar.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nulewalogozuf.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e836f6d7bce---99526821703.pdfIn PDF document text
    • http://cl-pub.com/files/files/gazowos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=civics+in+practice+textbook+pdf+chapter+5PDF 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_off0000c3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B0 16972 bytes
SHA-256: 9f35706b34869770e4e4356a3313948cf1529a40806b706cc94d135c2b745719
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 11236 bytes
SHA-256: d17d0796f508f4b5d18657151dc4033bcb6984b4ac4c9d7b444a017495c152e7

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