Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a0f40db0b77dba…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 22:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6839316354db6c6be1a10128a2668315 SHA-1: c25c060bbb290bd3e9607f3d744a09ac4441c889 SHA-256: b6a0f40db0b77dba7407a1564420d71d5e524dde4b2917c57eb2075813954a22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=adb+push+permission+denied PDF link annotation
    • http://engroupe.ca/aym_image/files/jurewuviwupejuli.pdfIn PDF document text
    • http://chpcentre.com/files/file/xunakatibupoje.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/siwekazil.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pitejigazopukafezir.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/36096439564.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/84372380891.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebbf42c68---71713144282.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107cb98cfb---37697511915.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/jukuduwazetedelatiwetuv.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613818d7001c1---94208802500.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/lekokusajewok.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/zugasiz.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///66600266671.pdfIn PDF document text
    • https://telenovella-bg.com/files/66098980026.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/rokizu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/zixewido.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/potimiwu.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/kuvasisokepalaxexe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kosonozexer.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/tumaxir.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/rifutotutomiruniniw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613684f0380f1---21804222670.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/suvasuwovususuvabu.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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10572 bytes
SHA-256: a716370ed2eaae5bf76fd70f4e5920d71631dd5ec6959e9c7a8638010abf5514
font_02_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 18692 bytes
SHA-256: 9545c0fe1191d17dad48a3363ea047d591b2a2ee0bcd7543502486a4db0c3ea4

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