Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ac9abe24f07eaf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 12:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fea16dbd1400d399b02e9ba562dc04f9 SHA-1: d085659f5a327c8547757675d1db3dc16c8a209c SHA-256: 98ac9abe24f07eaf9dbf06b5bdb8bbdaf4f7c324c64cfb1506f8f4f840c238e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://pwmtqatar.net/userfiles/file/89683582141.pdf In PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210906201836.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/81214357817.pdfIn PDF document text
    • http://xlith.com/userfiles/files/zusugat.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sjiv919akmlnrl7buq6ea3h1j5/setanebivuxanilivu.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/dusotofem.pdfIn PDF document text
    • http://stroi-sistema.ru/img/kuwoxugadom.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021092111205676.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fdee18c---mukam.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/xulawesuwenamumuw.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/gipusuvinul.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/bodafazufofimeloxivivoger.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/dopodaraluketeb.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/6898339011.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/56565784026.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/80130502308.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614272093c4d8---5191943993.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/36500029430.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/mimixasa.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/9958702617.pdfIn PDF document text
    • https://qkon.ca/images/file/furokupexilaxepilip.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/8066494311.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ba91b9b87---bapewagaxevanawiniwewipab.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/duborajolimiruwowesebesad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+medieval+build+hacksPDF 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_off0000b5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D1 17104 bytes
SHA-256: eaca52477c3ab8938b17114377c0df871a54266f266a7dce56187af8b1ab7eda
font_01_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 11012 bytes
SHA-256: 58f5893e9c463b1a36fb0950e71d7bd57067ac9c5171e859c37836b25f25de22
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1