Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a922da8db689564…

MALICIOUS

PDF

94.9 KB Created: 2021-09-06 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 761ec0029ec583b30b6d4c57ad1d93a4 SHA-1: 7bf2252819a9ae015fc68ea46cf46247c6097ed1 SHA-256: 4a922da8db689564811b280be9e1efae30966bbcc2589eac34694821da63ed56
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 http://michelschuurmans.nl/images/uploads/file/xibabati.pdf
    • http://mtt-association.fr/upload/file/foxoki.pdf
    • http://www.netcorp.hu/data/editorfile/53768061790.pdf
    • https://uat-tunisia.com/userfiles/file/22129029475.pdf
    • http://loveperfectionschool.com/upload/file/16452819484.pdf
    • http://rhodeislandalpha.com/clients/56223/File/gagonapulufivimunewuzewu.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085722bc2aa2---kewudoxaxudamezobak.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c5bc0795c---23071228689.pdf
    • http://studioschicchi.eu/userfiles/files/nabitolimiforadupoxugijuj.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/43c8032c17ef2e13acca9894b2d55928/20596055760.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b3fa65823de9f9bc3734d21e4f9ada23/xatanakazu.pdf
    • http://arslanemlak.come/file/gawibutewefunewapugowi.pdf
    • http://ourgans.org/userfiles/files/dutabikazasuvi.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/md9e2pbpsjt3ju5oihd33r38k5/botofedatalok.pdf
    • https://betalinktech.com/blmedia/file/29186851542.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6d7s5c1mbmq3g8rfkidk2sh5c7/4412812658.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b808c9a4---gilimojixumivomokurudeb.pdf
    • https://termofriz.rs//files/daruginadijumozusabo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=steinway+lyngdorf+model+s+manual
    • 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_off00010e3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 16792 bytes
font_01_sfnt_off00012653.bin
610ca418f03afddd88ad5174d7a7a8311df11595e799366a6cbfba920aecb0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 11072 bytes
font_02_sfnt_off00013ff6.bin
bb4f640a7c8b77bb2bbafb5c564d0f8ac22eb3d4ebc358a390a756d3f39a5afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF6 18024 bytes

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