Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f0918d17af2795…

MALICIOUS

PDF

102.1 KB Created: 2021-07-20 21:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09136db77f55a36a8e65edbfa2a5c63d SHA-1: 1b0f6e27fa429724fe216ac0ce750980219e2be0 SHA-256: e3f0918d17af27958cfa97e53d9065da0950399cde238a4bea31e45988ae2793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document's structure as a link farm suggests it's designed to lure users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086751ee0405---giwejuben.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8b0171b1---26800569090.pdfIn PDF document text
    • https://landi-bg.com/images/file/minugorotesilubi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c83338968e3ba4bc9fe8fbc51e9fec87/19524557080.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6qusdkb90sm76k7p7it892itdf/21093519469.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/815ip8jdti0pg7ub4d7auig193/jatefakumeburadavuluk.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/81798173658.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bamilirirakisarod.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/robitopavikurejepubi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1a05539c65148747d6a002ba83e1eb58/40837470389.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/risotawudakezorogixelol.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/medexikuzabibunemen.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/42794068521.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe652c68bd---91451069695.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/tisarusuxamebusegezob.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jakasov.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/30521186533.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740d80cb6be---80267134448.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c01100e6---71002047007.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ee3a8bd6f259734ed6a4992846c82199/31164162886.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/72837432101.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/15832971873.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a4aeec57---21034017976.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c771851096c---zitawinekimodesudorelos.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4300fc0ecf---jinulunam.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d14fcebaab585644797073c980f8ea8b/makevoraxaz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e63cc2994d9---jokofud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=contract+law+breach+of+contractPDF 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_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 20184 bytes
SHA-256: b735573147b9bfbf6a1915e6804689fd5fe42803d1897cc8d30a8ccd1e627ced
font_01_sfnt_off00015b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B33 10428 bytes
SHA-256: 66470f3e38f9438c8cd6a25def20d484aab4332535400d20bdb08900fe095019
font_02_sfnt_off000172ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1