Malicious PDF — malware analysis report

Static analysis result for SHA-256 100a40861e92dede…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 08:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36d1661740ab57598f8dd1a241e0da3b SHA-1: f787e0b3d6f807e395bcdd5eed3fbb514a19ad63 SHA-256: 100a40861e92dede50baac085306bb82d81b90a7911d89530b255864466a8c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gtlitalia.com/userfiles/files/bolipegep.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086aba8961db---koruxakadagumedot.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/zibejedejoradofazutem.pdfIn PDF document text
    • http://yejida.com/userfiles/file/4571183242.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/punova.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3408c12e61---girupixosizevat.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/jesuxoterawob.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25fa20f20---13319434084.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/35d1b38c1f3d3ecaaf98d0310279921a/zakejof.pdfIn PDF document text
    • http://technocom.pl/editor/file/nerutadiru.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/065bdcd042c5a4f3cfc4bdd9096c737e/kabexomasap.pdfIn PDF document text
    • http://bamila.vn/luutru/files/kapiwulodojilifefupak.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/skm6o17fd1183jrm1d725uqsk9/3751734854.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abb633e7702---dipokegijasalixupef.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/72127915879.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/51045019951.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd404551d---dikijunida.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e5tbsgik0ard00qsf0i8n6lq3r/zozifur.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea905c7e0---wabosog.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/15260217484.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0e50bce5cf0683abef1b6d29b95b6757/55400171976.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608581c591e9b---duvevimujisedekapuvuga.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160963f5b27a2d---94687321137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=verb+to+be+verb+to+do+verb+to+havePDF 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_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10112 bytes
SHA-256: c03a4e74c7451595debf97cce019f4d7ef5be889a09568fe0c083bfc74ab28a1
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16756 bytes
SHA-256: d6326e204f5a7e534bc7e459398a09e226ac416b8ed25fc6441a3750300654ab