Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb61c1cbedf129e8…

MALICIOUS

PDF

112.3 KB Created: 2021-06-13 20:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 89296e4467d54c5b59c727ecab7116f3 SHA-1: 0db9b85debf4f354bb128536298f9ee261230d04 SHA-256: eb61c1cbedf129e88ac6b793e2ffc867b02a710e647ebd31df210fdd22ab0b58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/uplcv?utm_term=macdonald+almanac+2020+pdf PDF link annotation
    • http://billedbutikken.dk/articlefiles/file/43716644511.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b487c35778a---10452740853.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d6a8252f---sinomumawamimepewilag.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/63502650802.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/loxokiroxoruwerawopatojo.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/digesuxanon.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2c340d7a---30712563137.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1b65659e---41168110528.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b3f431188324c3efaaced55846de0569/184647928.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-25/20210525221133875675.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d738ccaad464063a2a8ad00b1940594/kopusevexojebimakukibef.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/um9s862lf67lm7nq2v6m76t3n6/nosoxutan.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tumokora.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/24724338472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17906 5304 bytes
SHA-256: a1f68d5ffdc88253000327e8a970e9c0993a350791f6ef95f7c6b58772c36c0d
font_01_sfnt_off00018b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B14 12176 bytes
SHA-256: a157c94878a8427c5cfb0a21edd9e16c689877316741f3686998824b5ee6999e

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