Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa01db4c14a8eb8…

MALICIOUS

PDF

100.0 KB Created: 2021-07-02 12:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32d9cc7822129cb35c9f830dd90168bc SHA-1: 9c3f197a04e4c1f94be4e552ce5e391cdb24f089 SHA-256: 8fa01db4c14a8eb8c13b045d4938aedce4ed14957daa4dde829ea461203cdeec
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://tims.ro/ckfinder/userfiles/files/gemufekulekuvekosu.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59f63d7df0baa8f975dad734364bff56/kojujigevadewa.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/33730397990.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e9d0b9835f---jadojideko.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607791580dfbd---rozagorimolizozo.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/44419885152.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/74505621359.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq81mk8fkr7rue8cvr4jrfcf12/jokerer.pdfIn PDF document text
    • https://andrejc.si/files/file/28965223797.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd08b4d85---vebazebukikomaf.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/50d891bf19d3e0dbfcf88e1046b648b2/zuvobi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/84b1755dc8bad3c6b7c532e77f9f1dd9/zesekanivokinoxiru.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/nurikiramonenipopi.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/52983182406.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrsag6d9gb2vcvsaj7bdbugh15/dusagepesunojudunawofajeg.pdfIn PDF document text
    • http://fittbikese.hu/files/file/tazikikatisov.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r6evcm18qe680auap8o3qfh0jl/22492377861.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/wafifaxa.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/pilazibadokat.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f8336049aa1b0bb4fb51860cd68893c4/9172407321.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/09ec90e8a974c4b4e603bc2796df51ee/37266173544.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/39268158810.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608179c466277---welivasofafedof.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc5626bd8f39d3476722ab377949d293/35297328444.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/118c3071ea8c662caeee47f7c7762fa4/nogepozeninalowubobo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/5468509648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hot+flashes+while+on+periodPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10672 bytes
SHA-256: 566440b718956c872b3c7760f5bd225bdf613b1b12348d9826f01a0e6e263ecd
font_01_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 17428 bytes
SHA-256: 1b404f348512d606a14cb25a3a0de7c1f3f88d6d814436ba6b6491c7e39ad56c
font_03_sfnt_off00016827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1