Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cf26dd6ec285f1…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 01:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4fffccc44faacd799efb83946955ed0d SHA-1: 05aed233a592983a050b2f00d7d1523457e80e73 SHA-256: 55cf26dd6ec285f14f8dc2ee6ed47da71dd7796eddfa31c5f8e89b0493891ae4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/44a70b6a235daf4292bd08a9ab22fb61/41728242596.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b996681c53---38465899547.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/vulopoluzusosuvemobido.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e742b836b19fa735f266578f112492cb/2243118142.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607710e195d4d---xorenenodutonomilapibo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215301342197564.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/93483375565.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/59985267968.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xetal.pdfIn PDF document text
    • http://stylekd.ru/files/pozazufewuzose.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7d7ccb62755cccdaba75011dac509845/dufuzoguvo.pdfIn PDF document text
    • http://iviltra.lt/images/files/dexivexesugisevef.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/mexuziros.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c7a05446---pesor.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a383b1ca2bd---95094609716.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vebevufabotodugifowidulo.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/78240726565.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/an5b88t3j3s52cvknsptof0ei6/maminun.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/gojirowijovotewakat.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vkukttskgoalsujvkcln6mqo06/sokilepajiv.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/givititowefu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/81486088800.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/32699578811.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/faf2bc44fb8298e2022bd91e47e5d1b4/digijebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=otherwise+known+as+sheila+the+great+pdfPDF 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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16856 bytes
SHA-256: e0a775a9d91eaca17be8c40a510479196f32e5affc5d32638961aed67b944f85
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10980 bytes
SHA-256: 974e24f560749d294bad0a3d30d437b83a52b052525065eed1fc611dd2a35626
font_02_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1