Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1783ab642ccb4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 21:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02ad8256254490210a49452e4c5e2bfe SHA-1: 0e21d9cf6140c0660c76e88d7a3fdd8815b81cd3 SHA-256: f1b1783ab642ccb402da5c635f5a4cc5fcdae24370cc502800a0844630d061b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress sites and disposable hosting. The presence of numerous external URIs, many of which are embedded within the document's structure, suggests an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the overall structure and URL patterns strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=familia+characidae+pdf PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb8770de16---moterozifipunuvo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/megunawi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/96563955981.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d8fbaf6a---75473449855.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nolobivi.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210617201054_a2guct.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/44723234374.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2a3486043ecc1ad50c10814e6051f12f/65565465854.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/podorufigoxigoleba.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/87760800934.pdfIn PDF document text
    • http://maxbrio.kr/files/files/68001867551.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a6c30ddd7d57675217120fbe5ef299dc/gulufa.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9d88955e5---68266492285.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/noralotobosezagit.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a461c841589---notegusuwu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/52749669168.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/79141894195.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093dc064aceb---61606487986.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/50042127236.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf2281cd7b---44427441497.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb73c4851c---seligixi.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/51262664137.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/boputor.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/34851118651.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6726497fa---bexefodari.pdfIn PDF document text
    • https://kueapem.com/contents//files/20730487159.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b252ee25967---fopenizeko.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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10372 bytes
SHA-256: 28121540023a06fda8f0c5fb3b4d976e0d21b6ffc69f56e40624c6874bc789ca
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 18104 bytes
SHA-256: 3dd4220025e126e2de68d81e1faa84a22d9385bdbaf4ab01c4c44df56b95a3a5

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