Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0f006b722e29be…

MALICIOUS

PDF

89.8 KB Created: 2021-07-04 10:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f1e28adc8ab4b31c3857c93e49d6050 SHA-1: a65dde63e2319ff950d10cf6a1ed59ab80b78661 SHA-256: fd0f006b722e29be4bc7ebb52628ddedbf9128eae242fd1316a1001ce37cb9f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0gge4cp5j1bv644d9t7ig5i4j/25219206435.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/moduwo.pdf
    • http://houselandia.ru/files/15101775213.pdf
    • http://espacioschillout.es/images/admin/file/31726181225.pdf
    • http://csc020.com/userfiles/file/20210630063632_eehfyc.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f67d622bc62efb92d0b62bde72db1bd4/karajudojulavo.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f503737b---nevinezuvur.pdf
    • https://debcopharma.com/userfiles/file/nowetomidofagamenapebar.pdf
    • https://jotelek.hu/files/file/waziwusuluvatofiso.pdf
    • http://sarlampa.ru/upload_picture/96104489906.pdf
    • http://kartywspomnien.pl/uploads/assets/file/palunewemik.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6731acd3e7---79297550148.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6015a77e14---3277561489.pdf
    • http://afgventuregroup.com/cfiles/file/geniral.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160744fefd18ec---24186699651.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/47794853341.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff88f0e75---71293329949.pdf
    • https://jambukuning.com/contents//files/jajufagerafedurabi.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607271ef3b038---pezosix.pdf
    • http://zatexpress.com//upload/userfiles/files/60441656044.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kb15aktp11ajd7l6fi642gm810/62634872851.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e94ec1375---20936441910.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=questions+on+population+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_off0000fc0d.bin
271deb55e06f1e0dde1ba4a3dca1a1c03fefd2d03eb8822c5e05a0604e8d70c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16900 bytes
font_01_sfnt_off00012806.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 16792 bytes
font_02_sfnt_off0001401d.bin
bd155b75f7ad679958b1a8f09649a636cdb06d7c3199f62fe2885c9da9454109
pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 10548 bytes