Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d17649c8475138…

MALICIOUS

PDF

92.0 KB Created: 2021-07-03 00:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2763a8f55aa8c8bfa9fe4bef6e366c27 SHA-1: 00602666284befda08ae84c49a5811d0b33223a8 SHA-256: 76d17649c84751387acf7f422a7a3584cfd6921bca43f25bb267aa81eab26848
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or utilize disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of distributing links through potentially untrustworthy sources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a8dc1aa8d740d1109c484271cb7b0710/46424157083.pdf
    • https://mimpiindah168.com/contents//files/30386847426.pdf
    • http://www.yoko-ono.be/images/userfiles/file/buneloxojog.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607266a30d3f5---7555947376.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078d100a5590---dobukejenewu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7uug416sn5f554j4ac94b67ec6/laruzetevuwesuterazoza.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bde18601253---pavavebolereguvuvomitur.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9eac30772---74078062660.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3507f037---gidonato.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083636da8649---nujatodefewudivoxetaxo.pdf
    • http://daindnc.com/fckeditor/userfiles/file/94747508290.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b54fcd2a9---mezolowadedotu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6e74eca1---3624485964.pdf
    • http://absigorta.come/file/nejilerenunabusobi.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b933cf13cf---vofin.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xamovuri.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jorol.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88a5477d1---24214669474.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c5e0b32a89791620b79bd5f9751af6b8/dulixudisajazifi.pdf
    • http://szyuangang.com/UserFiles/file///20723727351.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7283838d---lagofezasasisovuga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+android+tv+launcher
    • 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_off00010270.bin
a1420b577fdcd7d36b0b1de33bb9258212975afe2a100a27963a4a9768100cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 19008 bytes
font_01_sfnt_off000132bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 16792 bytes
font_02_sfnt_off00014ad2.bin
e36d15c6fd6d34ef10d5184d35f9ac29bed7d4a3d53f8940d0d75fad9e9e0fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD2 10684 bytes

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