Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c20fb905ca9c1b…

MALICIOUS

PDF

84.8 KB Created: 2021-07-17 03:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e56354742e1d657100bcf2e8faef955b SHA-1: 19da665a22bdc49bc9848e2ee9477038a538115f SHA-256: 47c20fb905ca9c1b89a8dc4bc72add1558c252cdc763c64fb9931463d705a383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the structure strongly suggests a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/bed3atjuudg5m84olfq07j1bok/40833220325.pdf In PDF document text
    • https://vegan-eshop.cz/data/file/wovukusovolesetipisu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/588e31508b50fcc0fc26aa59b80686e0/xitamiwewurimozunuz.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b8ce5681508e28936330237eb5f9eb53/mewaxiwadigaler.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fc3dba14c52420fa7aebce3d2283c32/fasoxefetagadoxo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qp01hr9pgegp3kfvnupe2g61qo/41223210194.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/85b7087f576c6905d6d602ecc27f0c9e/mikotojabigezupa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608753652f7a3---kirixutit.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/jovupu.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/vugukawozewoxaxa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/22b0b774adde554bc867943a03256120/88487430313.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/jepikirega.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/iguch1ufo6io22qbd8plbopapf/90229311660.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/maratawatoworalifuvumaw.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76a0d3010---jumamufolifaxizu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b37f00e2---49904286097.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/69840534031.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/35259125964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dry+perm+hairstyles+for+short+hairPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16836 bytes
SHA-256: aa388e4a1085285854c13b23240a447293331500a78bb8a96303929d4c8287ab
font_02_sfnt_off00012c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 10636 bytes
SHA-256: 1e9ad28e45ad6e4be00f6434624ae7bb513895cc3e09f63b18126d8f085b458e

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