Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0c5811fb039b65…

MALICIOUS

PDF

89.4 KB Created: 2021-09-09 19:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 782a45928fc410de48b37bfe9a9b2e03 SHA-1: 8ae7b38fa9e5c8d3f07475194873b27b71c52a92 SHA-256: df0c5811fb039b6569264a422131fd431cf97f75132fd25b2b35e9a272ba4816
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The presence of a link farm on potentially compromised hosting services is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vantaidongsaigon.com/uploads/files/vitibutedodewi.pdf In PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161364a4c48761---jituxezoguwiluwaw.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161388c4d1f0e4---48315838411.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/bojiwirifow.pdfIn PDF document text
    • http://taociren.com/upload/file/210904215034400126lgm38v483x7m.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/60719588224.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/1450906663.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92328389657.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/ragakatobasujuw.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/56079371932.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/sidukub.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/89127585120.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1g7v4443ehudptaam4g47pn001/dativininiwerabejawu.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/18590063941.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/makifivepebodejox.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/muvamiwasonajozaberubo.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/funomopajuzuguronotev.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/mamaxikupevetig.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f3001a82c0d3c992a092d72384ccd28b/lakofizuguvarukedevanased.pdfIn PDF document text
    • http://strap.sk/uploads/files/98353770538.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebeb9aeee8---86849761099.pdfIn PDF document text
    • http://willbramephotography.com/64398433742.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/galatotiderurekazafi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56f550afe---suwewipuwudixiz.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/33908800791.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/genelise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=unlocking+android+phone+without+patternPDF 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_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10908 bytes
SHA-256: 8673bddfa1be984580937fb2d8ac10aedbf82cd5df78c232a2a9b702ed76e278
font_01_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 18280 bytes
SHA-256: 7822eaef4abfc0f7f25775c46b3a305c100d14a851516426ff799eeb952d9409
font_02_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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