Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf63e44ce813120…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 07:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f44a18853f1ea686697e052202c2ae2 SHA-1: 966e2edeeb30f43625b9191709619f7f7b1dfc15 SHA-256: cbf63e44ce8131200a2b554e8afd02b0e5101975f82bd7538221af6067d5991a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external websites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

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://ketchas.ru/uplcv?utm_term=amp+hours+to+joules PDF link annotation
    • http://luisacortesearchitetto.it/userfiles/files/magumasapapagozimabigalav.pdfIn PDF document text
    • https://tessuno.com/upload/files/61490b716dd81.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dafixejudemew.pdfIn PDF document text
    • https://fivetc.net/uploads/files/29223223251.pdfIn PDF document text
    • https://istanajp.net/contents/files/refemawagebuguwomumej.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/92159280558.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/rorovunal.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615674a9e6a6c---paxutuxukewaniwilo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jenuxiloradelimuzojaniko.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161491f2216683---suxitiwuma.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a826aab4f---39896472866.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xudepudisotebogivojuner.pdfIn PDF document text
    • http://rafaelokazakov.com/file/rozoboruduxobano.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/83007716557.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/zivujiwotujejexi.pdfIn PDF document text
    • http://rsst77.ru/upload/files/42313138121.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/98284476876.pdfIn PDF document text
    • http://aweibel.com/Photo/file/63474832188.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/69799590993.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/60145053424.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/8507828378.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476b1472041---59949618733.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/71120484090.pdfIn PDF document text
    • 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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 15624 bytes
SHA-256: 18898339822128fa07a266fdd866c07918ca2e96fa6966f5aa2ddf8ed2141500
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10372 bytes
SHA-256: d6504a199e37532f16b57291cede9db14beda73ccd0d9705a221637e68d69a08
font_02_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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