Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e156971df428ae4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 04:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a690c38be1925cf080f44889023aeb8 SHA-1: ad56be9e50d65eaf8047f2d9f42028b1f7dc8d21 SHA-256: 0e156971df428ae47b119967497a5a1ed8c9f3a88bdb16eb86653452ff9d6250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=asteroids+comets+and+meteors+worksheet PDF link annotation
    • http://agataklimowska.pl/userfiles/file/94692156706.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u54b8jkhkhm5ffr354n37sqoe5/sewofixarovawubawarit.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/gemimawituvaloruw.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/jotegok.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b34b57bfa5d94b8bfb83a965592551c6/levupeluvazolizebatetekuk.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/25937095058.pdfIn PDF document text
    • https://luminex.pl/upload/file/rabozutelajoxebotuw.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/wudosojagaxet.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/49347023340.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/35073165328.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d7881a33c59720ac55ece9ffa8354cf4/vuzifemonij.pdfIn PDF document text
    • http://allycatering.com/userfiles/nevodikemoruvugadatabu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de2ad0147a4---85403680906.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/gupupalelikobikede.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/gexawaxaxulibexunal.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/827ddf38e2bff36e414430f8fc8fb921/74495940515.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f1bd192ac---gotibibiwiwipirimudoreful.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/148719f2d1c83299bba97da96efb1cc5/85143141311.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/338b1886b9bcc6dadaecce71748c574b/gitutunoredam.pdfIn PDF document text
    • http://gtshotel.it/images/file/fanunosasalukolefinipu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2827d56d59889a419fed6bcc1eb5df38/74129494536.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/38558998781.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/26074932241.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/lotaxi.pdfIn PDF document text
    • 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 10748 bytes
SHA-256: 8b76ed608473f39e46e0ab7873e27d84574d7cc6a3e74cae0a185fdd8d2c5f69
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 17252 bytes
SHA-256: 50831bb4318f8d62964327434fdb2be0bbd3ce83e0af98828dbeafa83741e395
font_02_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1