Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7cc3ebdb02de53…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 09:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4899200923cc059eebb394add88ca2c3 SHA-1: e13ad44e0a8c6fc0991752195b7ab1079664faa6 SHA-256: 7c7cc3ebdb02de53a1eed660135d2ffb73ef8ffd98c6b7fc08f886fe106b3a95
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9edc8a15---jozatabalupe.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/tegozisodegiwanape.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vb3jq736utv2cik05ulm386rje/73557497.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f51e4dd1---wasepigegepuranub.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/f81a8c701d02a69301a6c518aca8a5a6/79556305290.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a83e04bb---sinute.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0dfe651d8e12764ee3edc4baab602b8d/12504364978.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/15798334348.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/votogurawovixeduvekux.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/dojitanex.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/37254816091.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9381d939c---65169053439.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/xibizavudagutixo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c337844de7d---79663179560.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708dbd13731---rulebuvatop.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaaa71d9c---98617982304.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160add362c5238---13955657426.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/osgti66vkq9pc2fc8iekfsfigt/97171749543.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/komusowalutuwipiponezig.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/xetokukirav.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210615145644_06hwbk.pdfIn PDF document text
    • http://whatdwellswithin.com/file/86208494582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+promise+of+firePDF 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_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 16980 bytes
SHA-256: 5b543490addc755afd4c73bdf7c7acf8d460504f33d8b3152169396447be99f9
font_01_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 10088 bytes
SHA-256: 23fda7583d5f1bd082daa716d175d0536d3894ec2ad04f46146394efead19fce
font_02_sfnt_off000136ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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