Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be2bd137f8c7063…

MALICIOUS

PDF

91.5 KB Created: 2021-09-03 05:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c65cf94e4c6b4c9b9f406c80222bc16 SHA-1: dbeec8ab7b127ca3ed61c5d87516178e3c362b1a SHA-256: 8be2bd137f8c70633eafd40e32686328bed86bf5883a653c4b9cb2047308763d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on potentially compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or spam distribution. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://martonelektro.hu/files/file/29620614699.pdf In PDF document text
    • http://hydrem.ru/images/file/sejenapatumije.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/91kcilg1k8r08p15dicelqi116/matakavodegekepumetugiti.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/6769944807.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/kagegofexipugusanozo.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/gumikusuzines.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38e5e419b---fujuwosomelebogefemub.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074888faadf4---datopuzebegurefawes.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e9c68c22---24794068968.pdfIn PDF document text
    • https://digireg.li/upload/raduganafofawuk.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/48394501848.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/wemomivawikepezepanexug.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/mibabeneduk.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bawinunomulurig.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21062518531056776732vy1j8lo31w.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f3e89b6782404c036407d3342be56984/26546744366.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/22854604966.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/pagujiwozidumozoze.pdfIn PDF document text
    • http://cartopack.be/Images/file/69972835210.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/72587567932.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/78869391536.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/fitupufi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc55134bcd---71279226085.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/415c1fbe933a312346d50bcfbe7d7687/41559761368.pdfIn PDF document text
    • http://coffee33.ru/archive/file/muzozujoxuwakosuw.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210813_F9181CA173BB18B0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=brassage+g%C3%A9n%C3%A9tique+exercices+corrig%C3%A9s+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 22640 bytes
SHA-256: be0b5420987e06b3c64220f11c440db62cf21486676dfee9272b43b920503877
font_01_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 11304 bytes
SHA-256: c0b487870e2b17c5d4cffdf0335de847a263ed4d5bc3e03b6a06191e5a925e40
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14779 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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