Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d15dcffe262c5a5…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 13:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78d371c7faab0de3e04660b99d2038e1 SHA-1: 485c945253aa6b916f056491d7e568777f282458 SHA-256: 6d15dcffe262c5a5fc4b76be5c9de7527e5ea77e7499c8e3261e2f30145a7b68
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://daiichilogistics.com/uploads/news_file/55617868645.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8f08cd5d---99878461510.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cojsdjfqml98uh2pcb0tihrglr/28503660275.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cc67381f3---67453958366.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084c10f43bb3---powenep.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/darizorixewovexemopixuw.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805ccb81d---rewokonalobab.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n0qj32dcv05s02traihctr1cng/85381046590.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/569542f60b04ac676dcf005735c2c428/4552886418.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8b48014ce9392ffc39780d827ad6ead3/2929664423.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/75109663b0134f1f31df5c205829f792/56925190172.pdf
    • https://mosconi.net/userfiles/file/54933929215.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210601194340.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tail+wagging+the+dog+similar+idioms
    • 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_off0000e43d.bin
c9e6f91fb45d3b31aa9bc263741ec212cb5b30f2e66550081c810e77f4a1ad28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 10744 bytes
font_01_sfnt_off0000fc97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 16792 bytes
font_02_sfnt_off000114a9.bin
13e520959729bcc023731a7a5956b1468176c95f339fb10f8de7c33c0f222e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 18120 bytes

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