Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0c6006d2f95a6e…

MALICIOUS

PDF

69.1 KB Created: 2021-06-19 11:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ab6cad37b595e0b893696f793122906b SHA-1: d7870125fd1e69aa20d1a3ee73746d4adf6cc792 SHA-256: 9c0c6006d2f95a6e70842e8d6db8bd313b5594dcb86f078c08394abd88368a72
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce718156f---17009373928.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0602b87abc---debuke.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/62435150019.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ejf53f2ihlrjcvpmdr58luogqo/38010748345.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/04uaf4ock38mke9ojq63mhkqvg/lukaxazelazedolones.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712bd91be91---34876505644.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7fa6966c50239825f72f89a5a5f1462f/vugawilumoxub.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/vajuziduzom.pdfIn PDF document text
    • http://premium-t.info/files/files/disixejajarivovekowukede.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1b3e1a9---beziwasazimoronigodedibiw.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/wumokubu.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b744b173aea0e19c9fded7bdae3ca767/vezolevowetumakogelutima.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pnti0oh261emsie8g4ap55else/xamaseduvide.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/57d80d46b3ac00351fdf5576a31b455e/29239716214.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/61478467423.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d1d330109dbfcc06d05f698270b074dc/meliled.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/94738426160.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/69c0253d48356be06941fb5d0d5b6b6b/83498307254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=liru+the+wolf+girl+with+youPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 3156 bytes
SHA-256: 9b2df5c56c79f1419cd71276b823ce37c04498a92bdf8f6bbb7810e41d64aea5
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 4776 bytes
SHA-256: 04df5821e2228845e98ea3a1c4868eddbda6f4331ea7700f2d7c348ec4bfe8ae
font_02_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 10220 bytes
SHA-256: 5dab970874203185f407cc3ef59e19de8c28357fbac9f1550924642576bcff5f

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