Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6848f949f0cc5e6…

MALICIOUS

PDF

86.9 KB Created: 2021-07-16 21:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cff73256d731da02bba21418496256fb SHA-1: e8eb110c4c672dc0c583392b938b18659cd7154f SHA-256: e6848f949f0cc5e68893241a0611ac1ff3d008cf2e0fb711a5d2b9ae321a4fd9
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document body is unreadable, but the heuristics and URLs suggest a link farm used to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092890c27d4f---76896819420.pdf In PDF document text
    • http://diversecityuk.com/userfiles/file/34157330369.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607895ea7cf3f---81637751380.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/dowomujurubazem.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/zimavegifavubapu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/kegujamexu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2a3fa54c45de49114f46992dc1aefe5a/74701133046.pdfIn PDF document text
    • https://media-get.com/userfiles/files/38385297603.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sekazuvujoramuvimebuvu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b575d0a35---dupowezo.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/97276219898.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/g95dqgi23v2pkkm2ucfa8gb6f2/bakiwuliw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q0kmkomd4abm5s8t9e32i3obl2/menojunojekawonukir.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/30091676974.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d05119d80---82818712238.pdfIn PDF document text
    • https://argumentua.com/i/file/84994575462.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/29398921337.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dfc1d9283ae39937cc695d7dd5141ffe/pazafijibiviguzugelano.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rg2fj8lkd7fj3oe01td6645t7e/74776968494.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b541f814d2c---41492488229.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/limokip.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/84285481990.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/05b7bbc876e31996d3b593d2e8242bf0/56922922616.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/wegig.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xupasufakug.pdfIn PDF document text
    • http://www.emailposte.com/pictures/getogujazefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=median+life+expectancyPDF 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_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 17552 bytes
SHA-256: f68391f5364405c78824f32b2ab1d6e69df4d4e6a6f2af61169747d73caa5a83
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 10432 bytes
SHA-256: 27080c2d75de899ffeb5408842f6ffb4078dfe8d4ee5a6be6c322efe410fee74
font_02_sfnt_off00013684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1