Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e916fe60263ed9…

MALICIOUS

PDF

89.9 KB Created: 2021-08-09 22:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5159c6079c5d67378f08719292237472 SHA-1: dbf3735ede74981db5c6b0f35a852d667f2b59a3 SHA-256: 51e916fe60263ed9938252d6b3e81de19f923d3f5bcb06531786fab95f30feb3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to distribute further malicious payloads or conduct phishing attacks. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bb87469ca7f17c061e8d06c0f05a4ea4/45190443025.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912f6d2069---bovetevo.pdfIn PDF document text
    • http://teresachild.com/upload/files/junavekejanawabogu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a752b235bd6a6487029fa53c3b838c0c/37359520534.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/13920986112.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ad5b25dabcdc2d5d9de098377ed8e645/diketobezax.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c54f0322ee96605b46478a4c51612590/bofafiwozekagu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4f4cvmg3nq91at2mfcsch0t2i/lowekabegiragediv.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160883252510b5---36851625570.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141107234441.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/mofetojagugukenito.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/282008524205.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e62c9c04---57212874701.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8d1cd69---lexin.pdfIn PDF document text
    • https://lesura.net/userfiles/file/84777085374.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1aaba2cd---78903584195.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0b01170244a05053cc3db310f0e788d2/63880700328.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/8216245297.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/67689348945.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/daadb3bc6db3f8617ed74d693f9bcd1f/60292328762.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608a19b6e1040---91458966351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+star+wars+origami+charactersPDF 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_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10696 bytes
SHA-256: c5e41fb9c6c5db960f08b15635123778946528c64cd3fa425efd09bd7e1211c7
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 18196 bytes
SHA-256: dc24a4be11d2ab428f3b9cebc1ee9f3681f60366cb51eda6719b03b9ecbf5b82
font_02_sfnt_off000141ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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