Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a8f9b4720063fe…

MALICIOUS

PDF

182.7 KB Created: 2021-06-30 08:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7eacbf8a5e180fc731392e52d7740e2 SHA-1: 408440b7264496dd61666c59f86b8aaf30fe6e8d SHA-256: d2a8f9b4720063fe0fc0928b8e9e0287689cd3db71e653b78b17f4b8a2843f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://pistant.ru/uplcv?utm_term=different+type+of+lice
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d781d8e60---83177202016.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dfe01a472---vopetugolowaniginulatelo.pdf
    • http://aostavet.it/userfiles/files/detajebasukibataxejenafit.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6c507fd27a67e0a69f1f3af3bfb714a9/nukawuvekugalakunitif.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d74aea7ef---wofijozolivibeb.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kta2mfuqgk23t60a5kc06v8dm7/vukekilote.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/91411841853.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a027739bc75---80857665407.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc43dae7f0---lobaletezewotebabaduvef.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd39b04624---97712610593.pdf
    • http://bulk-supplies.com/userfiles/file/gutewetinejafug.pdf
    • https://heritagecambodiatravel.com/userfiles/file/35471100182.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84e3ca266---28501317818.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21068af46---37474584238.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3e968710c174dc77def3c4de653d513c/97803769049.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160888ae07bba4---popitinuxix.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/06d4039e7ef723af37725e52250d761a/50577775553.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3592d0374fe41964f272a3199c66c0e6/vanazibakuwaxowabivigol.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607681d004ee3---foxibepamuzuw.pdf
    • http://banghetretunhien.com/media/ftp/file/28656559655.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608857eda7885---7154531136.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/f9ac9b150ea97c1cef03429e15d1c60a/xakejixuvor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024dcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24DCD 16792 bytes
font_01_sfnt_off000265de.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x265DE 16088 bytes
font_02_sfnt_off00027b14.bin
738e76597bf25d6cae220187eff7fafb1b114b629917c7c47053623455496ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27B14 10260 bytes
font_03_sfnt_off0002923f.bin
1ae3ed0972198a2c93602510ad78fffd9dbe82c3b2befb38f2f0f3d75f01cf01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2923F 23272 bytes

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