Malicious PDF — malware analysis report

Static analysis result for SHA-256 6956f2e82c2daeb9…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 20:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95d785284494b356b8b641a746c36b2c SHA-1: 0f9e394386a2495ca902811fed912f3daff3d4b3 SHA-256: 6956f2e82c2daeb960ec61f547f8521b0fe987a8b244adf8f31f981007e51851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, many pointing to potentially compromised WordPress upload directories or other disposable hosting, suggesting a link farm designed to distribute malicious content or engage in SEO manipulation. The presence of external URIs and a high number of distinct hosts indicates a broad effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://progfin.pl/userfiles/file/takufukuvujevosuxopitapi.pdf In PDF document text
    • http://skybuildinfraprojects.com/uploads/kozuju.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e22b0b193e11a15d100e63265a1940f/gazuxodevozojuboguj.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/pexarevefenalifos.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/984f678374fd87e566610511f45bcd37/dakegadute.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/69347971961.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/39281807035.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/15290270794.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43bcf42865---26510748643.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c2254dd4---62385991417.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b4ced32a08569c99b5489373c25dce91/gupuj.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/81328278709.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/78ba6e271210cd8b50eb7a6bff52e117/79359686223.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b438470d---tugukatewiragerebasegubo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xajolokifuvoxuwisemajemax.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ef0b4994500f3dc944252694de1df843/43035700818.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/fumekepamoxigibimigifaz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a9314432cd2a18bc01b6c9d80dfdf992/67231609010.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nadefadeliromaj.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/48954631121ed97f6b9e2b6b408df065/44186539445.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vr2a4dnv81pt09os8t9td9546n/605227597.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/68002116941.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/gijcul4up4f66h427t8a5q08d0/46239237121.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/73mcfhmr6o9qepaebklkikfum0/zamizuvikononegon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=integrals+of+trig+functions+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 20012 bytes
SHA-256: 06a5517d346d19754be5c44c8b49c1a53e7e02079044e8361931c8f5b067bcf1
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 10848 bytes
SHA-256: e595600ef7f884e632ebf4e09cb781673d0c0b5938bbce240d2f4fc1f993cb15
font_02_sfnt_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00014971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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