Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4f01831867ec29…

MALICIOUS

PDF

89.4 KB Created: 2021-08-08 05:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4309998be48cdd191c982acc51861cc SHA-1: 4e3c7e128d9506e80f77bcdbeab7bf3f8a6e3e9e SHA-256: 5c4f01831867ec29bb69ec78f0024f8bbe3ecd30cacb258d365786501aa4a340
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or phishing lure. The presence of multiple PDF-specific heuristics related to URI and link farm activity further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=complete+idiot%27s+guide+to+music+theory+free+download PDF link annotation
    • http://goldartline.ua/userfiles/file/57344619529.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/lozezezixugukudifevuselug.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77dc73cb0---66150581838.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/980cb10d995baf052fc8eeba7b0fc0a0/seletikup.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/menp56bot39rtsre2g4qo8rl5o/30062062571.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/xupakidul.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/44695606842.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/gumebusiripetutup.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/10824573852.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/nebapimajipa.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/47036056067.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/15621794415.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7s8c1beo0rkk6kivhhikk23fca/94779337427.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/48695796632.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831156df188---61178070787.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/87f602bc9206112cdc626e8173d43369/jatifod.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085727aab7e7---mebibi.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/9491796129.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b84be573ea---92567074963.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jalonea4k5iu9v96mm3ufimat6/futojagotizus.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/bubomolilimaposewo.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/63627993357.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/24304165510.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/rebanenurijofixutuk.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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 18388 bytes
SHA-256: 2be3f5be52e87a86761c50cdaba149b352b971a8c63f3c7d8d96ecf08e3029f4
font_02_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 11432 bytes
SHA-256: 2838695ba364b37bf9e7bb63d5d2c72f9c29e65da33be26b228c3adbe857cac4

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