Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f86f1b86b7d408…

MALICIOUS

PDF

85.4 KB Created: 2021-10-01 08:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b9f79721251f0542c77eb3da092f5e50 SHA-1: 8e4efd89b5ff13bd7c71e8b32289a790dd99f581 SHA-256: a5f86f1b86b7d4080eadb32786294080339aec095e85d52a91f5c0a936fa2a65
204 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites and a lure to copy/paste content into a command-line interface, indicating an attempt to trick the user into executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://efckrakow.pl/userfiles/file/xirukoxakovuwozeg.pdf In PDF document text
    • http://www.benyowsky.com/resources/files/tebopurir.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a6a0574db---burojuzetaboburup.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/mafusivijufuvixap.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/59948348503.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/tagelitan.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/66701057519.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ed2a1439237670e4d4db158fd830df46/xumogap.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/1440616300.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/73192605517.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gaturabop.pdfIn PDF document text
    • https://razredna-nastava.net/files/59001120775.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/48528707436.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/kifogofarokaxowebun.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xuwubujaporoxisojuwal.pdfIn PDF document text
    • https://tigapilar.com/upload/files/12289891568.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/43226128653.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e4b8149c578dc9730ddbc659b157fb58/38677655817.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vegebitato.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/98381172218.pdfIn PDF document text
    • http://envigest.cz/upload/file/wonuviwuparojotuxumoxuk.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pewurowufiwelaxigibe.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/kinimatuti.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210902080348.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161533bd037860---56060921515.pdfIn PDF document text
    • http://katela.net/userData/board/file/53136057665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nokia+lumia+820+android+y%C3%BCklemePDF 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 19396 bytes
SHA-256: 3f230bf0f3d418b91b20386f5a2b244171e08a09f6df93bc30494bf60ab8c958
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 11068 bytes
SHA-256: 99b5353e0f258b15736d0ff49dd78b5a95a8f676884351ef60dfe0f567277c0e

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