Malicious PDF — malware analysis report

Static analysis result for SHA-256 781013cd3572d196…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 08:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c2b106bf11d92e3ef1abd8d2803c274 SHA-1: 315f4b20fc708671a2fce63e8ea610d19c9e544c SHA-256: 781013cd3572d196b4ae6c927534a9bc621484d8d28e4ec083a241f51424fd75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087384e00c46---29118227082.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f533e7de308b0a22e6902824b4cde7c1/lobegaxesolop.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7435e36545c707893df930e88ae15a2f/xaxitipiniragedov.pdf
    • http://alliance-ltd.com/userfiles/loribugugijamujulimubudir.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f5f8d196---rugiwolekozenu.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b6802a675842e065522d22b18edd49b/bibuwunexifebadadonu.pdf
    • https://airflow-skateboards.com/upload/file/masanilezowojarariva.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08a4f07b08892ca020856a074e0b53ab/depifowozosawadibavax.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dpr7an8vr1h1sbqacr52ldtg0q/zerinaxejopu.pdf
    • https://moveo-sport.pl/userfiles/file/91542265263.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7b215302---70774164133.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aadba4c82b0---26195209986.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fa3490fc372d9b7ffa8ca8e12648163b/dukununiv.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f761fa8705fe63e8e88c684c6fba8aa3/12920425813.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/7708655975.pdf
    • http://cokhixnktientien.com/Images_upload/files/84575099343.pdf
    • http://preserveproperties.com/userfiles/files/19617393423.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2584abe58---xoverewefipalikofewifikug.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6422969b---bipexixapir.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-15/20210615015458183507.pdf
    • http://zavalinka.by/var/upload/file/lazisetupunoguziriwu.pdf
    • https://mattress-leader.com/media/zobuzalotewigedazadejatid.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8vk8nt31lshkb0mg8u3tn080j5/raxomawogovusixovalujus.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e530a446a---53843814448.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2925d37e6b---raxotosavorudukikuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=machine+learning+books+pdf+download
    • 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_off00010152.bin
315463fa8f1cc457bfb87628027bb0aa9dae42525f2c7cf2c4d9af08156b65a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 17708 bytes
font_01_sfnt_off00012f8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
font_02_sfnt_off000147a3.bin
adff3b6634422f431201c37007da55c6cb6d26cfb2d6003f9449b366fac9cf5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 11112 bytes

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