Malicious PDF — malware analysis report

Static analysis result for SHA-256 865f58f9754bdfd2…

MALICIOUS

PDF

79.6 KB Created: 2021-07-20 22:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d4828f5c1eff8c9d5ab56606070d557 SHA-1: d6fadb0689b73bd92f95993ef8ff0aeaa0c49679 SHA-256: 865f58f9754bdfd234e67a5ca850f65d4ce3d2d290973c69819997833d575a6b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple distinct hosts and the use of 'utm_term=converter+from+pdf+to+word+doc' suggest a social engineering tactic to trick users into believing they are accessing a legitimate file conversion service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b755d60caa3---direbeka.pdf In PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/57d259746e5cb84949b8b363f0ad357a/69937311693.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b8d6c7c7f---vinumunizepegufado.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/95001084726.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bb9l7s8ms26gdeh7uhjsgoi0u4/sumajevolezetumipuw.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/48383878921.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b97a4e77505358a229d87dff614e183e/98234560386.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7940a9d1c328b657954b2342aa5940dc/70174892934.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/amu6i731f06bmk0eh2fi3jftj2/13387833747.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/99863847515.pdfIn PDF document text
    • http://email-database.info/userfiles/file/xadatosasapiwowuvaporuto.pdfIn PDF document text
    • https://onlinendttraining.net/files/namilupak.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc16061132d---62276551733.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160767e3d182f3---73080260930.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/rabepibilotibobatemelelaj.pdfIn PDF document text
    • http://irollee.com/userfiles/file/93156632085.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/11124176105.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbd74a205---wasonebunode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=converter+from+pdf+to+word+docPDF 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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 10496 bytes
SHA-256: cc311ba8274896b3f2f721782e53ab6217c3669816bf9f4d22781b7096f2c68d
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 17612 bytes
SHA-256: cbb67a7c8bd79a237476843e436e0be34cc0c30e90cb64dfa64283e8243fb8ee
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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