Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcba1b6f771bf0f…

MALICIOUS

PDF

79.0 KB Created: 2021-06-28 03:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96c5e311be58d0a868d1dd7f6d2f3bdb SHA-1: 9346cfc5f72a77545e0e98dfe9fcf3e3fc6e48ee SHA-256: 0bcba1b6f771bf0fd2853957676ab061af00044cc1c52047ac3e293a87421711
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or appear to be disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://inifd.london/uploads/file/67005172680.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/99496a21a533b5b4826dcb8ce9331d44/54510338620.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/55963189937.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://festival.bg/fckeditorfiles/file/sipafozezudov.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3950482f---jukesipikupaniwisodovep.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070f820a249b---tojagugi.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/bejiniluwovese.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/tigumepupixejukasa.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/suluxo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608f123ca28d0---83572305400.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/70422867886.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/53707855048.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098c14c5bd98---50817149628.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/1465198391.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/dubuluko.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae5c354f5---sevonosebigufojoboxiviram.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/nirid.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef6d340f08d1871c6b9ae9c8c2be7285/gajepevupinigubazano.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/44305587812.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/wejatotemoko.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c157373dd5---57100078927.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e19f0ab2c---166660425.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2c9954e845906c1fdaa3002f3695c548/nujobovopavevoguwoj.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zofomonabadeduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+are+you+wearing+in+spanishPDF 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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 10776 bytes
SHA-256: a8867724f0d414def732fec34f040a55379b4b5031231bd6ebab26765f08e576
font_02_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 18420 bytes
SHA-256: 33d2ea72c6e2197ce555ff7f6272eee7ca733a71b2d1f24e3c7dc2d080d396d2

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