Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae9b1b84873177b…

MALICIOUS

PDF

85.2 KB Created: 2021-07-15 10:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21d8748663602f5cc9786fe296ca49ac SHA-1: 608404e95bd3c37da57573420be159448484ffe7 SHA-256: aae9b1b84873177b2eaf04a90fd38e6fbe91b0eb21c903a4414c0566872c64e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=ab+initio+meaning+in+law PDF link annotation
    • http://geologocarmignani.com/userfiles/files/2989659137.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/mitenabetujulebomaza.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7e2314d1edc5609fa63f40837ab1d235/piliz.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/22106301817.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8c0b6a74415ea9b2cf8e9047f418994/41918254892.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8262764291.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f0dcddca---55774993001.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aet3jp2fqeca9lkjae9gavvrq0/naxudej.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160857ae08165b---nuwewodakelibobigonexuwo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/49479382955.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e4fab7b3---52618665212.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845da5561a7---61031357439.pdfIn PDF document text
    • https://vestol.bg/files/file/60536113269.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c115026d0c8---15510940650.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daaa3e1fadd---56893367082.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7906421f3d---15184068656.pdfIn PDF document text
    • https://arerp.kr/data/file///34272682370.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/82100407724.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/46586808642.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bed953cfe5b51413ece668964eab7f73/genunuxagajuxevopapewafem.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pumuzataxexeralalakiru.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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 18944 bytes
SHA-256: b347d09429faaeaf8ace212ace6f09bb738c67530e7ba868c534886102eca5ba
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 10392 bytes
SHA-256: bc47f0f189a939a45489140f7bc15dcee7513e433316b04209b5db8a1d5e9beb
font_02_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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