Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7b1f162c5fb128…

MALICIOUS

PDF

92.5 KB Created: 2021-10-11 23:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ff7e94a9c07f47a044b11d3e1536219 SHA-1: cf170bb8c52bde4a8465ffe07515dba7a0371383 SHA-256: 6d7b1f162c5fb128afae8c550d3682a0ecde78901ec9eb577eedc48566b7fa14
196 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which appear to be part of a link farm. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=linux+recompile+kernel PDF link annotation
    • http://wskinbody.com/data/boardData/files/zoworokazuk.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/79995499756.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/nisesaw.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fccae0a9f114d483c47bbe442783989c/refubaxawuxamulogebop.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/tagabilaboxo.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/63693598146.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/39237074172.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/67259013542.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/kugut.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/33307283678.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/xowajolekonupibokipos.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/98125728371.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/79920279277.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kovomasubogapelara.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/74125737583.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/30196458770.pdfIn PDF document text
    • https://reniuved.it/file/75844579398.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463ac69efc---58485598165.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/jazamurunidileraliboriv.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210919125529.pdfIn PDF document text
    • https://clickbox.ro/images/file/sufebuxeseg.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013d50864b---51100626984.pdfIn PDF document text
    • http://bjjiffy.com/upload/13266286826.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/28872091154.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390e4425452---remilewunuxel.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_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 10356 bytes
SHA-256: 9efe20e6309d4bc073fdbc6ba1ff10a27dec6d0154dd97704262ec0037830ccd
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 20256 bytes
SHA-256: c705c6c31928b490488ee51a65eee2bfe9a2e4a103b491984209001ac9234885

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