Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff156110bf0e3241…

MALICIOUS

PDF

83.6 KB Created: 2021-08-03 06:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f371c5aceea5ce64c8609cd781dce75 SHA-1: a6d4bc4fabf44d1679d3fb6514823d2eea3bed38 SHA-256: ff156110bf0e32419a939fc151db8ad5aeb21820fb83897f487a7d03cbf2c83b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=how+to+convert+image+to+100kb PDF link annotation
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/63a330317c1f874d0f78275f243ad46a/68643308405.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/17812540661.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a77ddea---suduzoz.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14827a0fb---73472749353.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/35378753147.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/068kimhun0pmkj3sfhkehg6mv3/sojunanum.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jesalagupesojevox.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/kesesode.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a89710447a3e15b45628776ed2c82472/sukedovivebosixojo.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/31556421213.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c73de4ea---witojuvegijipaxu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/12642281295.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/7245908585.pdfIn PDF document text
    • https://artenika.pl/fck/file/vemefavizexe.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/afd4fb05f0c4f258da4fe8c5eaf21f6f/tiwiwovovozu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60aac2521---795762919.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/14hiutrcqmi189h099e71t3pk7/mosovus.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/a0hfinepugrcq3js6v8vd76vq5/67188477519.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/14546374332.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/537feefad7f2b5ba8e875112d8c2e447/95622986538.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6f5e5b8dd9b27cc73287aef0c4f5fe9/gawefuwaxumumabufobifidu.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/teperovu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ad066ea0---kesefowijenajakiviko.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 10908 bytes
SHA-256: 33952c3ee0144fd450775865fc9f80e77f28887fecb45f0417d607f95f87ad70
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 17076 bytes
SHA-256: c775898c23dd5c37dcb705fea110bf62ad959bd68e9af1c8493158b2479058d4
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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