Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c99f2f99f0b69f…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 07:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5acb08f3f0a47da27b63521b012cecd8 SHA-1: 8e1dea32e703ce86287fa55c360e5a334beb4477 SHA-256: d6c99f2f99f0b69f60df3d53a32c5a78c15aaa58366ce2b3d1fd58a85a52659e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links to external websites, many of which appear to be part of link farms hosted on compromised or disposable domains. The presence of these links suggests the primary purpose is to redirect users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=female+covert+narcissist+sexuality
    • https://alice-immo.com/userfiles/file/51566659706.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/21557483856.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c448650---41570150326.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-16/20210616005201969686.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824c2acd0fb---xiromanolojomaralu.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/91460514428.pdf
    • http://studiolegaletrotta.eu/userfiles/files/velujanifixirekokajalu.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efad4b41b---19112899159.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/31fc1f05e6316ae96b6e203c8e302979/futebopudifo.pdf
    • https://cvsc.co/userfiles/file/balonameroke.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/826e80006b1cc752a40786479c43c10d/sifururip.pdf
    • http://wumag.pl/userfiles/file/suwumo.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077654a60992---66076631396.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7694e452ef84cfc4c5db39db30f5ca98/37515134191.pdf
    • https://agronlogistics.com/userfiles/files/wurinibibanijili.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 16792 bytes
font_01_sfnt_off0001031f.bin
480a30a124cce9848c09026ee61a1c2cfb338d8036af7f2db14c6381a13adf0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16528 bytes
font_02_sfnt_off00012dee.bin
74b8b61fd88eda1477751acf9553990da1a521267e49a08f324b9151ae501e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 10752 bytes

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