Malicious PDF — malware analysis report

Static analysis result for SHA-256 f763777d0b079617…

MALICIOUS

PDF

84.7 KB Created: 2021-08-10 23:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed3635297fa020368e1785fb612b97ab SHA-1: f5904ee3c0d616421842c5057b24b80d7ef2731f SHA-256: f763777d0b0796178685ff240ebe7bd372d0da1871250881f984fd04f8a36d74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing lures or directing users to exploit kits. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://amd-export.com/site/upload/file/58808075421.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72659db79---vopamoviboladetiwolagexe.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/025b096d6086acc18c1340f2e370562e/26004217027.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/mukipegabozilip.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/19430116458.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ccdf01a---84887042481.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rumugumiwolobuzotazit.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/6515094678.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jekadiz.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/xidode.pdfIn PDF document text
    • https://dm288.rs/slicice/file/82678911896.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kiramofikagex.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f68eeafe3---ludelorenakevagarin.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc8d718ca---60660462912.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/89830974374.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/35edb0726c7e5e650de53a6d9c24185b/rojuwiwegiriwezidox.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/47565003640.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xewimomezanilupawo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/vazugoritululiwetupa.pdfIn PDF document text
    • https://magatek.com/documents/file/6685565850.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092036e96df8---semexusugowidutufi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607273782e86c---bepafexetilitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=prefixes+list+a+to+zPDF 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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16336 bytes
SHA-256: 54e3485d0bc22b0bfac05ccc6730cbc3e24723f4bdeb1bd90861abddc387f7fd
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 10268 bytes
SHA-256: f64b888b5f6dbbfd5a5e8a021693988ae89eb0c507d629b899ce8593480f49ee

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