Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb4c3343ce2229d…

MALICIOUS

PDF

83.2 KB Created: 2021-08-24 23:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9cd8decc04c40be52e422dfc8496197 SHA-1: b5731585decc051ba3ba77b83c3145d764a9c77c SHA-256: 1fb4c3343ce2229dc2b3d71004341b4f4a56896d14dcf303b4031203b52d7152
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other unknown domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://thedreaminitiative.org/Content/Admin/uploads/files/85724674875.pdf In PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/87868678129.pdfIn PDF document text
    • http://flexa.cz/docs/file/tanima.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3eea8c8522492feeaf6636f53454d763/duwanuzuwowo.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/4ernimr0tda5u6aj81m7heh7qp/36969483944.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb74599ff761532aff106586790a1098/30980102963.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/67324757201.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/41066562982.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/lakezerexan.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/15068440887.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/lokipawaguxugufi.pdfIn PDF document text
    • https://etimes.mn/uploads/files/babakipamad.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/fomarifelufugadubiziwi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9af54f077d7aa3a504a553a92ca1c2db/8909035538.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9e1690b5f1392d98f73a049e00c97ea6/28320100120.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sajulafokisefobelox.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a01682399---37491125353.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/gowajoxutolu.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/voganagegusefediwalu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32e33a53f---12165153224.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/4697040509.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/fabosedojepeliponeje.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff895feac---45417825084.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86ec53bdcce5a7e1a9135bd6a62c86ba/xokazamesegudekij.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/jokenagimevagixeluf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fffa41f93911b0b4f2532830380e9a7d/rumefamipa.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/65262243262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+edit+data+in+pdf+filePDF link annotation
    • 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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 10300 bytes
SHA-256: 99c084156567ad49a28361a1477acc48fb3aad20440d3a95d51d5a20dd36dc6b
font_01_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 16496 bytes
SHA-256: e5c8f0cc51f56a3414a156cc2b18d14de910502f162c087e7e8df79643a0a975
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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