Malicious PDF — malware analysis report

Static analysis result for SHA-256 28807cbb0b049fa3…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 00:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: add8b1bdad2c392181f6731c05681461 SHA-1: 4cdab7b78a81e4c4efd787c7362507e552f45a28 SHA-256: 28807cbb0b049fa321d7c7913df51196716f8440e7ce13b1057604699d696a1d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and embedded URLs align with techniques used for initial access via phishing attachments and directing users to malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://archism.ru/uplcv?utm_term=career+day+reflection+questions PDF link annotation
    • http://naucseto.cz/storage/52258550772.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae95977102a---58598827662.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2193991f7dfcdd57ab7430e1f7735b10/dovukuwoxediw.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/79129076354.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/42890914338.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/12c8034cafaeacbef94363a1c5acbf5c/52113068598.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2555d8e40da5145d14537156f373b20c/48327654557.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rejosasosemojim.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7d9b84ba---toxozanik.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/64666398463.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15dd44f92a---dukivikofugejofug.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/60952244759.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/27c90dbfc5258239daffe2f97a4b709e/bekadolaletexatobud.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b896a183f---xodilesovutaz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d4949a8a6---jetewanaboni.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/96558710313.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/dirirukogebovag.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/develebubesif.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/43565394984.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb92a9ab37---vudokugunukor.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/9410373006.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2657a51c---40970429227.pdfIn PDF document text
    • http://salkim.com/userfiles/file/siwak.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/26ed68f22f2de9df6314adeb96c7a703/ralukebisowutif.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/755d2b626af903c36b98ca7e1fc8db53/4945542197.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 17400 bytes
SHA-256: e6be550e88b96b1c3b6d525249faa4ce4e5af7ccf8ed6c4f3a8526e5615f00c0
font_01_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F79 10860 bytes
SHA-256: a61002a51c5d2db1731166f885605c7f914cb4860fd513476455142bf830f02c

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