Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bdf3e7d22aff8c…

MALICIOUS

PDF

90.6 KB Created: 2021-08-10 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e6696f45db696de10ccd76cbd73d5767 SHA-1: 226f6ef9c689abc07332995dbb2c76290d4f1ae4 SHA-256: 92bdf3e7d22aff8c56538996421e82687a57c9c5395b1519359cc455d67dddd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chickendaylacrescenta.com/uploads/files/kakiwudumewuf.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fs9f3a636a51qhosgvbhutd4vc/sewozonosizutop.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc6f844d7---81732725123.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/vorure.pdfIn PDF document text
    • http://liyangah.com/Upload/file/dezanivabuful.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5a7cf189---pevudadiri.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/nogatapobilafub.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/nijediwivewirip.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d103b87991---330398198.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/8813659677.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9851e01041---ribureku.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5a74b7775a95f74a29d79abd20565434/wigebigopel.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/178e656f9cfd6b351b08afc41848112e/wamedikusetakaj.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/wiwaposofapinukegiravov.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/80094099185.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/68528983695.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d5d43e5985a6b818db47dc33f5b7ac26/15090596474.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/kaxegowiw.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9qgmd7u04aa4upttts627egudv/bilotugunemekalirogefume.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vt3ivgdcu163a4csblmq77hh2j/sizete.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/gebevorewakosotaguxubub.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q7l1htbhgp1dfv06bn653sts8k/vifamunatagar.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16245013911267578968.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/06jj4d08t28tregccne4g7qvfl/18064545467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+clean+maytag+bravos+xl+steam+washerPDF 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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 11084 bytes
SHA-256: 9fdab41d3f1ce67b0a3174bb8077f5d36b5be1c2a09595663d4e98378f1d76f0
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 17508 bytes
SHA-256: 407722dc726dc30e9c14e46e9e6972c3e720283896e65fd5895e8182c9db142f