Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b32bf6742d6fa9…

MALICIOUS

PDF

102.2 KB Created: 2021-08-14 11:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 229af251190462e01e241e0e39c0d648 SHA-1: 22fad8734e57bc1d6b46b82e050ba675741b94ca SHA-256: 43b32bf6742d6fa9a14176953b5c6fc79a939cc374bd985766b6a7648fe4980e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=analisis+de+poeta+en+nueva+york+de+federico+garcia+lorca PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/kmc50ilmc6naqct4gtun26ekmm/16754151300.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d3ef386f4f45e3c261006b4d605c5b1/54462878449.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae8ef6f2fb351332518089ffbfcd2fc8/rapevadu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ecf30d18---78399651307.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/isqcj2l6c6t4p2pimc9brjvpud/xozuf.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/54926339327.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/binojoliwesisesenew.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f106ebe0322dbf21d5dd12c3a06876db/83732234608.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/14d9vhos63a65b6enb4vqhndm7/18100857341.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/damojoxabikibisetamerul.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a99b2fe1c---joketef.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8a75fbe1---75821877690.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/50947776820.pdfIn PDF document text
    • http://flexa.cz/docs/file/95819795471.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e0fd1c928---wumuwojimadube.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a76701556---47742498611.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nosalulamive.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sp7qrtiammaaredt317963ttgs/87634416017.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/52729906751.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gifiguwi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8d49a19b06ddd52dc2a693165dd71ce8/tipibisofasifijigevime.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61730d1fb9---20930170847.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/98086574578.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_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 11148 bytes
SHA-256: 12ce91afb37e2a7387cf09ffec205bea4e34e79b7719c7dd31aba4199d7b4cea
font_02_sfnt_off000159f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F0 18312 bytes
SHA-256: 2632b1aa0796c0fa0cb671a5cc4d2b59592c74672d190bc69badf1fc38b675f2

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