Malicious PDF — malware analysis report

Static analysis result for SHA-256 91027d56f096d2a0…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 23:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2adfd59f69c547c0477b1745bc4fc0e SHA-1: 7b0cb33d68fe2de37170808eae8ce4bf62d3a2c0 SHA-256: 91027d56f096d2a0f0fcbffb6640e6701f01e9e9230614a7d572f433d9f7be8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it functions as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=how+to+insert+border+in+word+online
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6fd4e824efdbf1d44d511dfa3241d4f0/82131353383.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/poxaxi.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b98f88d7c122a305b96496687d280433/jejefarojaki.pdf
    • http://amphorabeautyclub.com/campannas/file/73213066460.pdf
    • http://interiorconsignments.com/media/file/gumosigagiladileviguti.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/xafiniwuboradon.pdf
    • http://happy-travel089.com/CKEdit/upload/files/50452367402.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/59c20b4f3bf635e522b44c7578f5dbb9/29416645211.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/18ab229ea8dd76595aa99a7cf6ff57be/99929680494.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6c242c373a7cf84807030cd32f5c1ec6/52202829827.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac181fad4a4---tudavureguwa.pdf
    • http://jtylek.pl/Upload/file/tisalevaz.pdf
    • http://nwatchonline.org/userfiles/file/dominowumip.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df217505f2---25577682855.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4e81db09f7eadeb169b4470b2c6ef372/fufinewutenofulopo.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c6dfbb27ddea3956fac47b8a45d4702c/83915366781.pdf
    • http://kfnmdg.com/upfolder/e/files/20210614143534.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce692f18a8---fezilewejowedijudijobar.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3e811ecfd9f07e8479c2e4ce6b304366/gosadekifumuremopit.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b110f147b99129ea04475a3cb180164b/30709844866.pdf
    • http://www.yoko-ono.be/images/userfiles/file/98900511985.pdf
    • http://ahcxdq.com/uploads/file/17193026857.pdf
    • https://samarpanbharat.org/trila/userfiles/file/54953263984.pdf
    • https://carsen.sk/editor_uploads/system/files/suminexixegarowebava.pdf
    • 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_off0000e17a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 16792 bytes
font_01_sfnt_off0000f98c.bin
173492b6c52af08463dab5a13266f5bb82f6fa8eb3c5ba8de22c6b48c2805ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 17508 bytes
font_02_sfnt_off000126f6.bin
299a1bf5870c9ca53b26100536130b69e7a6875fda8a701e8157b34dd59196c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 10296 bytes