Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a9f88b711b0e09…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 20:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b9a4705c74099dc1aef28eed5d735d9 SHA-1: 239d82378c7fb5f7e4b18bb01e52d9207129e8e2 SHA-256: 70a9f88b711b0e09ec3a5196ba97be6572c5bbfaf9ed9028bcea5aab2beb7739
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as a lure to direct users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://b-solutions.net/userfiles/file/lolubozuzewefomuxovurix.pdf In PDF document text
    • https://bunian-co.com/other_files/File/32211104531.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fapimusiwogus.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/lipav.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e450c149c---19522155523.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161443a30a5b75---rulaxomabedofiwozudariba.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d055150288296482a951f7e59eaba117/pemil.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/47637837166.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/71520704859.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/55723774261.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/jipar.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/jinuletaxalofefad.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/7056324247.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bijotilukekodawowag.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210916164515.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/64659698490.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/nunepuvavelapojul.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/rusesavutiwuvanes.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/zozum.pdfIn PDF document text
    • http://topstec.com/d/files/14524500241.pdfIn PDF document text
    • http://mweb.cz/images/file/86204441161.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/98005543053.pdfIn PDF document text
    • https://advik.net/userfiles/file/bebakigefozudalitesasi.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/54869757870.pdfIn PDF document text
    • https://znalac.com/userfiles/file/walipasefen.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/621194894.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/63626158100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+rp+money+glitchPDF 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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 17048 bytes
SHA-256: 6f2acad8e9614048afebcdc2ef5031993a8cc18273519798eba6fe36afb693ba
font_01_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10804 bytes
SHA-256: 14954388bfe63d34af4f0f01644358fe6f382a7c76fcc51360eba1fcaab47127
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1