Malicious PDF — malware analysis report

Static analysis result for SHA-256 86630bdf1d9304c6…

MALICIOUS

PDF

100.6 KB Created: 2021-09-02 10:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c8e5211dc3c289b95b0e9dddf987196 SHA-1: 2f18063d461409bf298ddfe51f625a923a91c112 SHA-256: 86630bdf1d9304c66cee23a6a12f49a655b58abc40008e3ec609a2a9b30e78da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b82dc805a35551fff040822236cc7781/23737861539.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867676f23a6---19567181019.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/76465224369.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100c0c65aaba---64413894478.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/kafabavemifipoxate.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/lurotimaxunesud.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079673845b8b---81120579878.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/4754706654.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a5d10df0---dizasejejurorajewo.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ep5nngtg53p8is1ehoa3fikjc1/xuduluwelodafit.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/51151364260.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1a24108f5---fogixodapisozeregafatide.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/rikar.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde74b6797b---saziwixaw.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/vidobuve.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2208af4c6---93669643627.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/u2f84ioe3bnj0oqete44hh8gm1/38818840621.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b9696c0---81120372273.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210831_BAFDA03293965E73.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/35959121485.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/porep.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074252711884---tugubijogowododekufiwab.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/73178536493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stomata+meaning+in+bengaliPDF link annotation
    • 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_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 22120 bytes
SHA-256: dc0e6a145b5be18c230ea2266bf05bd5070889d90b5a64823e1b6e558606344b
font_01_sfnt_off0001556a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D81 10396 bytes
SHA-256: 3daeb2830e2475fb2c80dd044128cd1fd0766299373b85d22400095542c2ef6d

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