Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78464f19ea47acb…

MALICIOUS

PDF

115.2 KB Created: 2021-06-25 16:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7a8683b8aca21e32283ae3b95b86a33 SHA-1: 8100431a3d113d9ea9a0f9d5df12eaf540289e89 SHA-256: f78464f19ea47acbadaa7dac0ecbf3a262b9ed8202bc2ddbda86ab66fa187984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=freud+and+philosophy
    • http://bahtiyardishekimi.com/fckfiles/file/871729941.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1tmbpopo14f8rur6b89qn3bfi4/xizadavaparujolonaro.pdf
    • http://backupcenters.com/userfiles/file/88920084048.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/888395480e1eb0ad15cc59cb885758f8/28889967201.pdf
    • http://smartvoicecom.com/userfiles/dazerofojegejopovanaweg.pdf
    • http://www.hydro-tg.pro/upload/file/papemuwugidojidajafo.pdf
    • http://alexlunacoach.com/img/editor/file/toxapiledama.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r4jmpasd1kh7vtcbf59nhog60v/memigatep.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/11661bd3bf297624cbf49b1e281486e3/62100545326.pdf
    • http://adria-ex.com/images/blog//file/jimamisumogur.pdf
    • http://teusz.pl/UserFiles/file/pusidapelajakirozadaro.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160976c1895f4c---55196352473.pdf
    • https://zebcom.in/userfiles/file/goporasekixapotim.pdf
    • http://metabolit-plus.ru/files/file/salilusetujizebuximojedu.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/dizuwafotejal.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0ad8f7596b748916628d532ea9bcb761/53060234721.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2jntv34vs7uiu7fbp49ok9grt3/dodinowibaboxekawowabara.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1f6a576cd7a2c1c98b007c801dd11197/zilukotasutigisirupof.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_off000160e7.bin
30a481b6e4d180f2baeb797a28e4f144257f3dc8cb8f865af2813b84960a4f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160E7 17624 bytes
font_01_sfnt_off00018e74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E74 16792 bytes
font_02_sfnt_off0001a68b.bin
2fd14e521eb81527f339658630ccbee57195608f43aa6ebde20e87a473e73db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A68B 10584 bytes

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