Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b4d88d40b5072…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 21:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f8b449821101e23b95be8b0e47973bb SHA-1: ee9e3239faefc3341966f0235de3d2ac3d27af56 SHA-256: 749b4d88d40b50728046507fc91bc3a08811c18f338f7c9417f61aea858f4188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=petty+cash+confirmation+template', likely serve as lures for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=petty+cash+confirmation+template
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec08a3bfe2---tinosadewofapopufak.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mpohvhfkfjinvpr2q105gsfr23/wuvizem.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070cedac6f81---71219693367.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f53vui2uvpg48sftju36in7agb/70204096742.pdf
    • http://posekatzahradu.cz/files/file/43830933485.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/38f66dfb7781928d537df8ba027bc44c/gonamipelodezotoxigijomeg.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cb2228b1---98978910903.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vaedupsv1gvlre7u6jdu6qevh9/7682924357.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934f8b2abf---97275857450.pdf
    • http://ruresept.ru/files/file/nomudikaxofada.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f4e09d6---75758275392.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942279ab51e---jigas.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/madise.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701023c6b00---zisotug.pdf
    • https://nevisnews.com/userfiles/tuxemunilobirevok.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nm4t5tp3id8c1i0u0pg6h3d3p5/39040602242.pdf
    • http://nktrading.qa/file/files/nukopuwaminuv.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/vidinuxovoga.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c65c35c9d---64850458133.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/favv0mgogloei9hgoeth8m86b3/tokokuninisivodezodo.pdf
    • http://panziofabian.hu/fck_kepek/40867680724.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/78ijcprkcrs1e0lctgv1opn9sp/linaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc9.bin
9e591e7ed1648c6c707db57a264e2d023596f5f681c07ed1e1226917f5d8e39c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 17208 bytes
font_01_sfnt_off000128f6.bin
918617c70b3c17654a32f6a34d00b0bb94e3447037807eee8312d8c43866490e
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10860 bytes
font_02_sfnt_off000141ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 16792 bytes