Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80a9ee6408ef035…

MALICIOUS

PDF

74.0 KB Created: 2021-09-03 03:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d90a251b08810bb264e54983c7fd6c26 SHA-1: 87f6d7018f3bd59983e2f027a8079f1a934ae980 SHA-256: a80a9ee6408ef035f1bb8c0866b6ec4c4587af5a3848b9c79f164121da88ed07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/mesanowabununevivime.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64d9db5a1---dirisoragonudidame.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pelegaxawametokisima.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2accc2a84---mawosufaxakan.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a294d8c19---zowugajes.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987c9def2f6---duxasalunarojokejuv.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/d6916c6c28457a31011e01007d335f58/27038504794.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/30059634581.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/suxorew.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/2638547775.pdfIn PDF document text
    • http://4bx.pl/public/file/dejitorijovazixexidif.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108120709551937.pdfIn PDF document text
    • https://areicon.com/images/file/72128553777.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/mubovisemagod.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e28ac356---malebasorirowegorazul.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8cfd27f8---xikokexoradot.pdfIn PDF document text
    • http://yjccnc.com/upload/files/60572574715.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/399828050.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750f00359e---fuzanuditi.pdfIn PDF document text
    • http://word.mn/uploads/assets/24967267228.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/vaxerinuzavinavuwe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aee66036f59---fagewimagedodigabab.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87949835731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=positive+and+negative+externalities+worksheetPDF 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_off0000bfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10872 bytes
SHA-256: 07e1aad17279663f168a77fe5cd87e8fd19308344816fb3839345af79cf1e041
font_02_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16164 bytes
SHA-256: 0d78d97f75e4123c129e1d3ce457a65ec06557c587965435dc85597a09f6b5b2