Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7789091308028bd…

MALICIOUS

PDF

95.6 KB Created: 2021-08-12 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e2797d783e7eb9064d119cddb21e7f2 SHA-1: 3414e9dfd797e6c733d4e65e5e378217c6d41d73 SHA-256: c7789091308028bd7eca1ac0065c18f14381f09f7ed25c5334d489543cf42093
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://hogies.com/includes/template/uploads/file/kapagivegatewuligafusom.pdf In PDF document text
    • http://yanarfabrics.com/firma/files/84909189106.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nedematumikatig.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zitosutokorusamidem.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/famutodizidebe.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/dukaxosomewutapulowuwazi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608035441b40e---38384157361.pdfIn PDF document text
    • http://matras-devison.com/upload/file/92844926326.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ff873c7fad0---guzilupaxetamemaxi.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/72849710025.pdfIn PDF document text
    • https://bnovum.hu/downloads/funewod.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/fiwapebepatu.pdfIn PDF document text
    • https://melz-feu.ru/upload/76464906331.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zufiratinu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ae9085f72---botagokogusapudagonim.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/98978395733.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/sowixadexobivoxafofak.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/dagujomivoxilaguvoxusiweb.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dibiloludikozezevugenag.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c28342b34---tilujuxinene.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28e357652---xafetaxenijozexogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fiche+de+r%C3%A9vision+vision+brevet+technologie+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 21788 bytes
SHA-256: 0f7a0f1a8091e4ec99baddc8cbd98c4245566b29bc95bcf0511689ef61bd5149
font_02_sfnt_off00015502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15502 11076 bytes
SHA-256: d7f27957824cc1b95f2a24a71a315a3768b6c4c4c00401d8223c6b1c86666707

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