Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8730240dd5fb98…

MALICIOUS

PDF

82.2 KB Created: 2021-08-06 05:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f3162b252c96fb2eb0576ab1535488e SHA-1: 35af165d2984928911cb4dbfd3beed6a94e9db3f SHA-256: 6b8730240dd5fb985a0092bcd4d5fa09936caca511c069a3b2a0dd17650c9966
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f27d5ccc1e2---larum.pdf In PDF document text
    • http://wumag.pl/userfiles/file/12714967427.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb1ddbb429---36735833121.pdfIn PDF document text
    • https://wagaskar.com/media/65709039761.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/89632977317.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/16ea48b2c72a577eb60beab6282e790e/6061218566.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/56409158177.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kumafag.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/3459036567.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/322de9576e3b504a265723924b62c6aa/90432873926.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/suwifebevemetaradoxam.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2d1b72c0d27ce4214460d52221ca3208/nezerikum.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd626bd2a48---mukenoxesekux.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/welarudokuforidune.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c463b2bbbf6---46126041127.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/wusenalugi.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/31100288029.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d2d16516---bugosimezi.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ff2b40f966e3f8e33997dd0a20e477f6/35755945886.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c7eb8d5920bdff329122754195c7d698/femurugelododeredufirepit.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/56885018044.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/48368608286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bohemian+rhapsody+guitar+quartet+pdfPDF 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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 11312 bytes
SHA-256: 9c2b964b496694f20e3d6dd1449082d533b5f39fc848a2e532f851515defe36e
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 17660 bytes
SHA-256: f96607280ac7250a62ad2a30feb193de3193dba66eb7dd850440e266ad3fff37
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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