Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c4e8bc02e17942…

MALICIOUS

PDF

77.3 KB Created: 2021-06-16 08:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c551d332cb2631ba9dd6e1be15dc0653 SHA-1: e9dc72dc0e2580bb332938bbe2701ae1be57eeaa SHA-256: 74c4e8bc02e17942664617bda7bdbaae9e63b86302cd1ac9678aca55b068b4aa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

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 https://infrive.ru/uplcv?utm_term=minecraft+3ds+roms
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9309891b3ce1a25a0a8767897d2a4b8c/67008836991.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93d9493e---tineloxilavalazedo.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afd928f7d---roterimosemeruribo.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/97160599171.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mtlj4e3hflgip5hu0f1d2iohnk/musijamerasexupatusugawon.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bce80a6e---fijikuranipuzukexifuved.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lj031egdv580q8c6vatoja82kn/42921190253.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc108b5e2---wezete.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p36gj7us1gchsmv4sm430pusp1/begoditi.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/52on6n2i2u34vtihg49mmhdaii/taganulefajanasogela.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/90602f6fcf5a1b6f81353cd782995d76/58348970607.pdf
    • http://stroisvias.ru/userfiles/file/75119905697.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc8e1fdcc---5222773940.pdf
    • http://alphasigmaoverseas.com/userfiles/file/pubizusale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed55.bin
2818f4f72d6de3ceb573519207961add21c79c0926db2b938cc8d949b6d1d5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5304 bytes
font_01_sfnt_off0000ff56.bin
635c343bc19007d827a639dc4d15479fc0024eb200fd56a994e52252186440bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 12668 bytes

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