Malicious PDF — malware analysis report

Static analysis result for SHA-256 308606da5db37804…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1c7e0daf3df285748b92ce23aa2038b6 SHA-1: 748a9e116e9de6f33edbfcc2f75764f77f5210c5 SHA-256: 308606da5db3780420755db524bf100e13215431d1a45bf715bdbf7251db90d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including those with 'utm_term' parameters suggesting tracking, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://meesens.be/KrMee/Tekstverwerker/51704999937.pdf In PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/sinavebusez.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab5aa42ad---nejilago.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/26414298224.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/95356131301.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nujapufagamoxu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7179ea672---34139945077.pdfIn PDF document text
    • https://agermag.ro/mm/file/rebax.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/nagatikukitutixovusurat.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/6495955637.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/4863550147.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/vexinenarare.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/xelonoz.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/guragutinulekuxagir.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/284408405.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/bebupa.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/xupegadenibumujip.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/wurisamimazuvarewujolad.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/pimatanez.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rulodudubaxutax.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/67181082048.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210913151023_904052659.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613819e61e7da---11822604022.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/tawab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=make+a+fake+video+callPDF 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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10148 bytes
SHA-256: 3185ac389bd986f23b7ffc31323c79fe0977272c6151c2bad17f33f95bbd2daa
font_02_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 18196 bytes
SHA-256: 9afb65a73c1cba18652a9251825dc9805fd6fac638c45c0fdee3776f1b55ec4e

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