Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2761acf9b7c635…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 11:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 969f9a0b2d0992dd9751561cbacc7c0c SHA-1: ea49a800127dd11692b00a2f3873cba1e753f2d3 SHA-256: 9f2761acf9b7c6350abeac6a0eaff436526ab0da0664bec4c27b7fe1296e289e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to download files. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://suurelepa.ee/data/file/23276264735.pdf In PDF document text
    • http://3sdent.com/upload/files/21143728471.pdfIn PDF document text
    • https://architektor.ru/uploads/file/vomuwa.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/mebimudizizulabimolenenob.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/6734874371.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gekoguzugawup.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/widafokoneg.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad841d1fa9---23312993114.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/12054159855.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jogawijalawozifarirov.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe9m44i4eva90eoi3ma7i3l3nr/xokolapoxog.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/fuwugixejeg.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/mejefe.pdfIn PDF document text
    • http://stonebreaker.at/34876173258.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/xiwetizomatuxupuwepo.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/49342670368.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gugoluxusa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee90cca4d---57606556808.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/fozabusovavenaj.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/0ruuvp7hq6qqjovqc5sprpkl4t/92083865591.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/fujuwi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jawanogefalirugedifotine.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/76538330137.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63987433802.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/10228389582.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/9570505640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=call+of+duty+mobile+apk+and+obb+downloadPDF 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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10952 bytes
SHA-256: 5e89e58fc1e9c934f6da5fccc39d6411af5075260de6a6fd93b9278dff84ab63
font_02_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 18260 bytes
SHA-256: 4de622f4015b733f345d6e7af710367c1ea62048696bdb7f81344d4e66a150c9