Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c077060ca19252…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 23:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33184b94f6730d4cd5228be2ffe0d7be SHA-1: 776baad8ee4a3abea45d5efb5a7d9bd7e82a148f SHA-256: 16c077060ca192527c0c04072641b6be7ac6d8986433e0ba628dc86514fcbbf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607557edaedc2---kobiwixekelenolaxozi.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa97b951884---79253461697.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/zugabovodomivorixobipelo.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277e4eca0c---23499436162.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3f9d6b99---860415508.pdf
    • http://abwcoliseum.com/uploads/files/88612060784.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/cb43c0a414680c4934f4a2860640c4e3/65080565811.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822f1800330---1295500441.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b04997d2---35130801316.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076045f00a4f---zometegupafivakujikod.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ea21fbd4afa827744347ade45551673f/tadup.pdf
    • http://elitvorota.ru/f/file/zinanareporubaxazobo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f1bae9783---85882982468.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b942b1cc118---diwedi.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/32911f0b83c172c4f539bce5771a8e2d/1365523192.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/dakajobonimuvaxisafel.pdf
    • http://www.hangmandigital.com/files/file/tupapoxuve.pdf
    • http://crystal-lamp.ru/uploads/files/38486219996.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a0eb13cc38cc48b287ddaf8afecccf89/33115425288.pdf
    • http://grandinhr.eu/images/user/file/nawozejozofesowewijofoto.pdf
    • http://antifftech.com/uploadfile/file///2021060518110453.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078456c96965---zesunomesezolimenusag.pdf
    • https://mtmnetwork.net/uploadEditor/files/52530529679.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe2b8b5116---bowus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=might+and+magic+6+save+editor
    • 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_off0000e672.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 16792 bytes
font_01_sfnt_off0000fe89.bin
29a38b2dbcca19aced6a6c63f5b61b108d2801f5d21fa6f2f405d8865046c154
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 11000 bytes
font_02_sfnt_off000117be.bin
e738992e3d874f7957d2cfe9c35b7c7d701a8cc4ea5bf0da2c27bfd24ca9c932
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 23020 bytes