Malicious PDF — malware analysis report

Static analysis result for SHA-256 235c8e0c25ab6a01…

MALICIOUS

PDF

79.4 KB Created: 2021-06-25 13:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec539645d1a93492a84a21fb1c1f4376 SHA-1: e7749b906360879443a82f59df89153a01dc3146 SHA-256: 235c8e0c25ab6a012199beaa405e408714502e192b9c080449ca3a130ef03520
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads. The primary attack pattern involves luring users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://asijskepotraviny.cz/files/file/46500414915.pdf
    • http://bygreenpure.com/userfiles/file/befoxodowipisokug.pdf
    • http://closehorses.com/userfiles/file/83878627453.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tb3qa9n5rfuqjmrhsqi6589q95/54078847343.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e2e81e6d757009604bc17fe9dc39ab40/tixodaxopazi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d52d4572e261e9af23d7e6570778c63a/jotatenejefefo.pdf
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/sonarorirejimorufefoki.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac130e99112---liveturoxemogojat.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/n59q0gqmfhug1mht720sdfhaho/ragotesototuzejiwezidewo.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/148119a82363b36097f5f0fd570b2b9f/704474423.pdf
    • http://duancanhotot.com/upload/files/loxikuwogiwit.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2541116055a4a15f4e5cf425a30fc8a8/lufin.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/412b1d064019e15a1a13de53865fa710/vudixodubevax.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/49cb0631b58d44ad104cd8d5bca91d13/govakufizatemekubekikini.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/465005f1649dbb8f4b85cd423dc02b37/muvanuteno.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=objective+physics+for+neet+by+dc+pandey+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_off0000d146.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 16792 bytes
font_01_sfnt_off0000e95d.bin
bf2640b7e9f78335bc7520e192088bbb1ac1e95d246724a7910fcd74d82398c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 11148 bytes
font_02_sfnt_off00010329.bin
1427e9fffc9c9ca5c1cad4bcbac4da690a9ca71f667d5f64cd3fa2e2991baf04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 17336 bytes

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