Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e119f978a178e0…

MALICIOUS

PDF

79.0 KB Created: 2021-08-31 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6dfd9dba3940e55d1c67b92a8b3273e SHA-1: 076440b88ba26d7cafdc7457f2f8f929af005ac9 SHA-256: f8e119f978a178e06c88d74307749c251d597a91617220e1162011b9fa70e75e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely as a spearphishing attachment leading to further compromise.

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872f474c56e---netijopar.pdf In PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/eafd99f47ec33204de0aa9f05b3a3ffb/97737830266.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e7365705---dorizi.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/kafiba.pdfIn PDF document text
    • http://benly-carson.com/product/files/zoruzusawufelutex.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b597dda2f---dizudafeba.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/903a5772a5f0b3e498eaeade5c924915/fitenamewegasumarixos.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1d1c1chqg42t4otdg00et5d8k5/zefurasaxasedexezewupab.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l5eqa0fn3cgj1cb60fi5usbda7/49421087381.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06f069367b---vimeronajutepe.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/45247119137.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/fatorenegukumuzexizulu.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/30940037489.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc2a0e0ab---38319523767.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qb6ivffd9tm6e3uj3415h3dge1/piberugemuzupo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0vdq0e12si029u17b1a8msuoa3/japiwafopada.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/94983561614.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7c47e4c517db9ed7a704f20cdb923c2e/wugoxon.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/75210598413.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fesorasobaxov.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zubuxajuzejodepedokejefed.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/dozenetivebanut.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db799cb7a66---riwizaravusabulaninewodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=similar+areas+and+volumes+worksheet+answer+keyPDF 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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 17324 bytes
SHA-256: 9edce0650ef3c3afd8adcb58c12e48c394e0b52455ede43259c5bf0e6c4cc095
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 11048 bytes
SHA-256: c2ecd647d9381579e405a2ef3da8c3d6b6cd77a391459923f992afc49dbb5e19