Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f655d6af5deaa8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 07:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3da9f2b9999b5f513f04200d88a17359 SHA-1: 865ada495ba3795da860f18aafb74be48a3478ac SHA-256: d1f655d6af5deaa891d459854c5caa648e73ffa58c1843041a518ffeb6b484f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://jamisonfurnace.ca/userfiles/files/nekos.pdf In PDF document text
    • http://bostonmentors.com/userfiles/file/10989931180.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/melobepobinoregofiruruxa.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d50b695b12a81c919c6e52894a9caca8/41388815217.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bba402bfa28e7018154721d3694858da/rivizuzi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b43fe19824a---68285277395.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/139818204.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073759139a4c---12536964191.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/5433676623.pdfIn PDF document text
    • https://geniodelweb.com/file/57857863973.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/dupuv.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094017abece6---78065960647.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55ce7064c---beduni.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726607914ed---11015554617.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/maximesaj.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/fafokogamukelavogoduxoj.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a08732e86---57814037027.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jodav.pdfIn PDF document text
    • http://atomleasing.ru/media/File/54257106304.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8a41b3d68b6b574947745c0dab96d9b4/37368382319.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/8826541827.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6abf39b103---38468954879.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/68429572130.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/37214899123.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/mrkve8dodic1c6km0tmpnifkrk/lovojaliteweromizubi.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/bepoxukotopawofolizuz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f40d74aa6---63870718254.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/borawifupawotiduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=piano+chords+cheat+sheet+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_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 18560 bytes
SHA-256: 555545d1e93c9517781e766dbe0e05d0cc1643f778525d5b9967665bcde6d264
font_01_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 10672 bytes
SHA-256: 4532691c47d9ac20f89cef34b6089dfb1831e9d9cb0c5ab3389581d621041fa0
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1