Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99256e664b42c63…

MALICIOUS

PDF

90.2 KB Created: 2021-08-06 16:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb0bfbf4aa17cd2a0b7ff6e8a0ec38dc SHA-1: b099999a46c10e2672dec91fabce324d2ab33463 SHA-256: a99256e664b42c6304cc9e4128b6f27dec44d6af4caa88d6b547d1fbca94ebf6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting 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 malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=how+many+days+is+12+weeks+not+including+weekends PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10edd389f4---somipidijifusavosev.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c5f38532076bceb69ffa3a1e92a07c2/40831873225.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc0746ca2---vagelukefap.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726dbe76eb7---16411353185.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/retibavavakit.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/vuwurerotanomazigirufut.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210607184852909198275.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nt98epk2v4pesn6d6sfnqnsk71/fujixijidinume.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b1de6d01fc4b8d49a7be8f68dae708fb/jaxizuvalubori.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mobuvagawedulabulukojerim.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210617082206.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9d2b7443---radagolugifuka.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xobonejekeletemabutodoma.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/11833561204.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/88094290213.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d4f89295---41345053852.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c67ffb086dd06757ae37fd60eb9dd0a7/87828154842.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f9d1d48a0b45a4ccb3f5a488b5daba07/peribijov.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/guwudide.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/35897996423.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/92185769861.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/15614864690.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd580d47f---wobazofezalavarogavan.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4221df0a76---34026288557.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://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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 17008 bytes
SHA-256: 663a247b45ef27847ba0fd2b3583a03f3a85ffbf20b66e1e0a7bf53121b55f64
font_01_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 11168 bytes
SHA-256: 331dcf4bc984b17d270ed30dabdbf2a31a0121efa614ce691beccf336572edb6
font_02_sfnt_off00013fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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