Malicious PDF — malware analysis report

Static analysis result for SHA-256 df71edfa5cc295dc…

MALICIOUS

PDF

103.0 KB Created: 2021-09-08 02:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efd2c48240e568c81dd80eb1c6537219 SHA-1: 82cd13318702e1e2ff5a41c57745b05c6d8facfa SHA-256: df71edfa5cc295dc9ccb141d92b3ca2fc13c86fad0bff2dc369507ae99d79a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://mariellatriolo.it/public/file/30072793201.pdf In PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/gevenilekaku.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vih45smmul4urc9d6u5eqe8qm1/xuzopejatum.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/9562132587.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nuvevitavemodofibo.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/13999681154.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cf911124aa0255266f00b2488ef289f8/43207525625.pdfIn PDF document text
    • http://sushi-belovo.ru/files/lovebixi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609730c931110---35732964329.pdfIn PDF document text
    • https://zold-kommando.hu/files/52075164098.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vabezamabap.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904e8d66433---wugesajinolitiren.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210825174519.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4e8496d6---43505420986.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sa1rbqm11tte9iqs4md7mn42l4/sedidapino.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zawuzasakubola.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/59957911706.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4bgtsv9gn18gtio0orjcairar5/95893327575.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac940b6fc8a---51326643716.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/15289438448.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/fuzasexe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0384180ebddc9e10773714bc577b40d0/xuwulurerulinifepivuzuze.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/feniruvogaxepomub.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/zigezoforezanabilogap.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/11f12563de75116ae9e3aa8a94cbe916/kosegiwufuz.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918827c1db2---tavaweweporugaxibepetit.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/63299031467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ducati+hypermotard+796+service+manual+pdfPDF 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_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 19316 bytes
SHA-256: dc2f4cddf6f5d68ad3aa79499f729408bb5bde7904de17c96b3018c1ac401085
font_01_sfnt_off00015a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A55 11552 bytes
SHA-256: be9f47e9c134bac0a9dc1a25999faa9ebc7010c3a1db8a69566bc676b1c50c23
font_02_sfnt_off000175a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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