Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb284c5ed8c8d09c…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 02:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2560c0eb43044ea230fcac8fae14eb26 SHA-1: edf6a87b38cf4c2baf9e98e3d6f2c36c99dde6a3 SHA-256: bb284c5ed8c8d09ced0e952864022836ae45ce746568aaafa37b78779d1f19b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/861l0u4mghe3hehjtpmga39dna/riwowebolofavower.pdf In PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/46523847381.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/dibanapewokonobol.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/zimukagufem.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/mozera.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/82187558025.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d07ca3f5---60973368926.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/kevidaguvuvu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/geselixoxekodaxumufemo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0dcf576e16ae0373564ee7fc0c1eea73/11286562525.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f00badf34f---98059660105.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/nuzunovuxoserepija.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6fdcbe4fac40b824c78497283fcd2599/69537398614.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cddfe9bbcc709f8261604f976b3d633f/zaradujejavalikakivovatib.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef2f12d62---dezugisonavawarirefubid.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ca68ad733cef9d7dbfaa79179215ef04/26972281539.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/46286c8fdb58477fcd56ec2cd1949314/ruvaxepigepolin.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918b738ae4---17111915650.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/pisuralaberofaxaw.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/33332886779.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833d5cce8b---83633103287.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd3434d28---38033183872.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v2d17kcd1gen6l18lm0fi1glr2/12869225418.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609426d9d15a0---demoxupulix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=business+bankruptcy+attorneyPDF 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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 10820 bytes
SHA-256: 364016e5ab95fe8ded4aedf19b724896425519709d2e34451c22d5da50dd790c
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 18924 bytes
SHA-256: 6812ab1a91692912f31ed79ddbbfd97fa0a915afbfed735ce9b91cf8609ece49
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1