Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76414220959a3fe…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 05:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08fa862aa0baeef3571eaeffaf041c1b SHA-1: 61017feb625b641e5eafc2aaff2c03ce8f2a0739 SHA-256: c76414220959a3fed22276e178d3828d8bf7b13b6bbd2232561c8eb2b378f4ce
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://doxity.ro/ckfinder/userfiles/files/delofelaginuseb.pdf In PDF document text
    • http://gostinica-domodedovo.ru/files/15940067982.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9415e8ddd2eaef24c1806ad1785d5624/vuwirafel.pdfIn PDF document text
    • http://skisun.it/userfiles/files/ginagemizulogu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tatotubifurabikigos.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/32002279145.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/vunelokujovesemober.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/bufufuxefuxukudo.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/61845441095.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/xanegubojeroninavikabuwav.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090407173457.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/26637622506.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/pitemidutevib.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/viniretibivedububi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156582ce9345---gapiv.pdfIn PDF document text
    • http://gestionarival.com/userfiles/file/memoz.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kurovepadamarosipite.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/80671230520.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/65053697504.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/mulur.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/8927015937.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb2f2149e---nulepakufutamoterodapaw.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/zotedisemugibolofobewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=june%27s+journey+hacksPDF 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_off0000b0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E1 10552 bytes
SHA-256: 343bdb9a031eb352abd0c10494896a9002de69bb86030775bbdcfca104d60e17
font_01_sfnt_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 14180 bytes
SHA-256: 867a972c51d1c649545c2fcf707a93f0b893783f521322edd7fbc56de548621c
font_02_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1