Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf65454465f79243…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 02:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 629ed93b68c368e8b87136453288de56 SHA-1: 9b23f423ca645a60ec8d3a32f8edc88303de42b2 SHA-256: bf65454465f792434268dac936dc8905cdc20e1dc8ab49f76f10e28b8f3466ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The file's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=aerobic+and+anaerobic+training+in+soccer+pdf PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160994e92be937---xejefudikobetij.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081483fd473f---rupojevegix.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/81166914373.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b0d0030211623b97f46e5c946ae8640/80136933378.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/nuwozufikux.pdfIn PDF document text
    • http://benrassam.com/uploads/files/54749631753.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/misibadi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f5328c6---noramolexu.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/85711233250.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/83866383037.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/tojok.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/vaxoxotuworikijopuvur.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869300cd6b---rajepijejofuxanakoridaz.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160725c66b3574---70284342255.pdfIn PDF document text
    • http://accronline.com/userfiles/file/44632063358.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4e2468f685c9b0f5433a0019e3cc7fc8/xotezewotekukilaminiv.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/85ef5cc910f4a2da1525c0cd3c067c5a/54207285696.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178bac4d4c---46283152318.pdfIn PDF document text
    • https://wecareprogram.org/images/file/39867728882.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/46676342698.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/91793124636.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfcfd2b50c---lanufoxojotajidipilup.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/67966603885.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://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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10868 bytes
SHA-256: f373d7eab8e2d3dac42e5a7158285c8031d517f0a14269962d8efb3be6e3103c
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 18032 bytes
SHA-256: a697ae35dbf1dc3fead62e40bc058a3809b892f04ddb53e2d749533a1a7af37e