Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb70aacbf62ccd6…

MALICIOUS

PDF

89.2 KB Created: 2021-08-07 14:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b0031ec5224b2ddf4c3a7d00b2ecd6d SHA-1: 71fa788d18e489f49142a8574e47c7a93b53a0fa SHA-256: bdb70aacbf62ccd62a3b008dbe54bb22b3899a631d284821cc07e212fb6365c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. These elements suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autodilykanka.cz/cmsimple/images/file/76613300744.pdf In PDF document text
    • http://monkey-do.net/userfiles/file/20375313844.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/67952856646.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894921e4c39---42077900012.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da30c94b38---74400774091.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vabanuvodagazoxi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea645b78e7---pibujulazenotugosakipafeg.pdfIn PDF document text
    • https://noddy.nu/images/file/33976029422.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609d91f4ec7a7---344345645.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fe775d39f8fc0b9c3516a970e1af568f/vevomavakubuxaweribix.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9365c5e1bf809bb3de0f8e0987dd56b3/70372840759.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624726705.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7563efa5---majagetaluwaxira.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/36525578960.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4294e5e37---tepenenupigerib.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb94d61ea---95954949385.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/0f11cc840b3dd683fd0c390f84ee2860/gaxibukatebavawovejokip.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/37837647579.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/fitorikawoko.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/7503469688.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd49da3b6---vevom.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/50512770079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cyberpunk+2077+johnny+silverhand+gunPDF 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_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 11540 bytes
SHA-256: 6e476e37b9b1a61b7fde766aaf704c287b9f03ae742915f372f8c5923c06f189
font_01_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 17492 bytes
SHA-256: 8c8bdd4dbe8f7234f6f991427baaf4989db5e778c5513ea9a30519c98daadf1d
font_02_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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