Malicious PDF — malware analysis report

Static analysis result for SHA-256 db41322087b9b211…

MALICIOUS

PDF

76.1 KB Created: 2021-06-28 01:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0abe9c5f10b248824341e0fed606f545 SHA-1: 785bb00e9796d72acd96c7740669ae091d894028 SHA-256: db41322087b9b211ae9e368e91c071f58c8b9bafe14761038eb5119e5d0e338c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=symptoms+of+prostate+cancer+that+has+spread+to+bones PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/03f63306e3f15da8195029720f85a0b3/73948442158.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/87687393978.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/98d8337310d2abb46cf274bc5f822c90/47487379642.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/79719225495.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/jatokilepimo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g6m5bv2n4k50300i103b8nbuu2/33025426297.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/pawidagotorogenisadepubid.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/84845734930.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb84c5fc56---3737433730.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d9f3ed115d592567916228af72101447/63842062439.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b6079b6b810e811a5ffe84cb69afd0bb/88532682513.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210627154422_stbxw5.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/451872f1107cdb2d65405f2669f66b96/gugejasi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0a42d762---99660793680.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/168fcaee5cd38ea92f1c4d76ae498eaf/juvubikafipadigu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081b4655a621---93797908267.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e9ca9a03---bemovejabemav.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4395ce75d7aad2114d62af8a7a06c083/50180918684.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/47253908933.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///37116569754.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/61ae519d08c1012573dc27229ea7c2dc/zoxaro.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b67ddf50---86762790416.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf0e2475d8---81140030266.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_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 16204 bytes
SHA-256: 030de29d9b75a409d7f60b21eac078f14aa234b47a30f6a8c8744fe9d4e9f6ac
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 11076 bytes
SHA-256: 8a12eb463b0a1239fabd54383fdd4fdf4f4c15f96ec917ea5554d6d90c972041

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