Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af1327209156f2d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 20:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d7679b3052828cdf47557e4c013db08 SHA-1: 3293f4d4edbf5847e897480f5c34c67613c4aced SHA-256: 9af1327209156f2d182ceca09a0c75b7dc5b7cfa5c01a6766513f70beb7a5201
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. 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 to bypass security controls and execute malicious commands. The embedded URLs suggest the document is part of a link farm, potentially leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=what+is+the+only+neurotransmitter+released+at+the+neuromuscular+junction PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7aobliab38ic86mej6mrerfvu5/2008210258.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tefumusixaweferafira.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/mepisatotipubavunuxave.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vim7h8mgri3i4bbu9dk7akrmt3/rijami.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/jewekotifusabi.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210730045935211612ltmv32.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/xukeguloguzajusagiraxa.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/dbf00564e18410fca07b2e66900a737f/49374720003.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610650f7e6051---dofaf.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fdbe09b7---refoxagekesifunibekomi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xavakanuvilowuwemutiwo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/u0h7vjlkeatpf0qkphdon2qbe4/mowalimulurakemolu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/71077958218.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sekatefefunibikujas.pdfIn PDF document text
    • http://cabini.it/userfiles/files/ramatobodewetorukazaki.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5612bd04fd---walawolifimevuwukejuv.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f575d74f---57319897281.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/75754667864.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb4bdbc90---96901601698.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8354dbc3f2507da3b1bfbf23d98d30c4/ropavusazatolapu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/22415695662.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/dewadelekelapelavefigukil.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4599c693001eb6bb72b06eb663c33e73/90788299550.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/30461647476.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a9371a06---88741359845.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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 17840 bytes
SHA-256: f6f22bcd97951c13a93441d24f716bfc94467f8c9b02c45b2e4351451976f0b5
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 10972 bytes
SHA-256: c5300dbd9b0a36df78a1de627cb3e25841a25c01940fe8b10227d6cdab9558da

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