Malicious PDF — malware analysis report

Static analysis result for SHA-256 d549e974150ff9b9…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 09:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db0220723a7e529e833b69d055ff7b07 SHA-1: 9844eaf4c43ce7c23615e3a41ed2dd87575c3e7f SHA-256: d549e974150ff9b91037581475ebf135e626af567e59b7ea58d26d06016647b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into visiting malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=how+much+is+it+to+fill+cavities+without+insurance PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f837f37d8---rarijonedozekilobimuvadop.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aafeced5702---97983211554.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/bebovuvezotuki.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b3c4ccefa4a1bc0a625535f4c6ab8840/jevodumo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160895b0da5c49---21510757989.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210530083052.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/78867209690.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/xaloninupo.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/41328321138.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1b00e558e13a0c87f3d629a2c461eeba/33583330920.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24086486c9---63366797944.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zebosefopapezirogif.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5f673fdf---rujufezuruvujem.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e439a9f6af---lezivirevijuxutizape.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709526a0b80---garinetifamuzetujo.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/59305849176.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cc1d29535ae2d20f6182fccce504f38f/70210502779.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47281e2ca7---78054449931.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/91848240858.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/dodusexaxozagedujakur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc989a4d69b---97231966757.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/47312870698.pdfIn PDF document text
    • http://nature-revive.org/files/file/sajirixonetelebiwawido.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-25-07-19-06-efnKh6Sc.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/44913323011.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_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10844 bytes
SHA-256: 8e247bcf828a42ee2e8f5e7a64ed2a8c78e96b64048ebc02e8ebf965d959edd8
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 18220 bytes
SHA-256: d995c6eaca430bea1dbf49f7172ae819074213ca573c76bbbc54594a2be4a047

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