Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1695c4acaa6a053…

MALICIOUS

PDF

134.1 KB Created: 2021-07-28 13:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94086f2d1f88c6e684094b85e3a11857 SHA-1: 20dca0da423068cd3665420964729c922a2b1351 SHA-256: e1695c4acaa6a053d933ffc33c2aa16a1486af2aa6c84a7561f71889cb79ed46
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://phutungquanghieu.com/app/webroot/files/ckfinder/files/muzifume.pdf In PDF document text
    • http://silverleafspa.ca/clients/10619/File/xobefa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ff2a2215---nixenifa.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/660c3c497cbcc80fc351e6ae9b6978cb/55567587801.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/47895117631.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab8a4b55c5---bunopevofemedo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36d4100b32---penabatikoda.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/3365780284.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/kojumejadevatukabitowelip.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/53194930435.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d116cf029adbbcb994594f8c2cf4cc45/82945154382.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/36027720722.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bad7a44f12d---sigirevuxikudenoseniriken.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/16990797346.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/30335417559.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/78401567486.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/35057649157.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/levoturijasetugixu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5ef1e5be1b7a6aebcd08668de571dff4/tizejiwijolobigopigit.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/vuwasisesufuzezefazet.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/per6l0g2bkmtctq6u51fjbc3ri/vuwuf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf93f78d72---41222008353.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4acbc80f8---gefogagizowar.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3b346374---11422640701.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609acac1a44f7---17660254918.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/46464767292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=alcoholics+anonymous+4th+step+guidePDF 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_off0001a4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD0A 19476 bytes
SHA-256: c310c7a9e6daedb4095899d392d3cef8c87a5ad8bc8bf6c5c8cebe0a0b59f8b3
font_02_sfnt_off0001ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF5B 11136 bytes
SHA-256: 3527773a8bae426afe4fa194b8cf5940de6e6ba99006363e765cd8ef71971615