Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b7c3619038eb5d…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 04:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19d30688d3440278a75bc2b1b0974664 SHA-1: c96d74a9ab56c18f7f3b49f95a8897e5d3f30580 SHA-256: f7b7c3619038eb5df27cf4083daf9c8d691a91570cc3bbdf10219e3500affa81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, acting as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a71ac63a0---kifikutazabezodulet.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819c315cf02---nuweloz.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd1676765---88583128473.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0995a16784e830da81531a59f5433d1f/12637729701.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4tlb6ft776mmgtc7qhsk6jjh18/nudopipatapowalisaliman.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905915a2cbe---wapiji.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/facac85ec4c7618dfe480e764de60e4a/88293314856.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9kq7ml4cqb3f1ghvj23sn9utl5/regukiberimabazeta.pdfIn PDF document text
    • https://noddy.nu/images/file/88163703078.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/dexerezobumorilobo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i3r2dmagkckgdp7kefbh58afd4/14299192296.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/pumemonuj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56425602c---jirowaredexamigip.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5m6obfkv7ove2p8jmh5c9ph3j3/supirisisepexewesubikogo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/81141603504.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea8880498---60746530054.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuxebem.pdfIn PDF document text
    • https://network-italia.it/file/wipusozovadija.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/57195804606.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/93df2580965890c16da0a2ce518e6a16/zuxamulomutuwus.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/53084429717.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/1d270b84f8e2a535dc1eec1861726005/67236581407.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dinuvipibulovo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dbc86daa7---80520814492.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b1dc3418913e98ac400c2e2659fbb5aa/71680029263.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/90990049630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=most+ints+in+a+gamePDF 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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 18176 bytes
SHA-256: 099272a087350d888e0349f01c7cb35f6022c331fe94b5287358ddb4894084b1
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 10300 bytes
SHA-256: 245b0719aeeb6ceab9cf608702386ebe461c6733851fb162cf52d0dfb9a0f366
font_02_sfnt_off00013105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1