Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0799eea9a7d104a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 07:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86501c0ff3040afc143c2cea21cffc3a SHA-1: 8919a7e53767cc9b3b50643d3ee11f9a2dc1cf7a SHA-256: c0799eea9a7d104aa78849870cceb8633e7bdb716021f45b160694d06576ecf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=how+to+upload+android+app+to+play+store PDF link annotation
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/99444163887.pdfIn PDF document text
    • http://dd-eng.com/files/files/21073963802.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/1567347599.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/bobepebopisares.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/62374379141.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/dosabasapexagelimezado.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/50998897302.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pisoruvojubokimepu.pdfIn PDF document text
    • http://scsychem.com/upload/files/sovosekefovanebazobalinal.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/fedejivorivilufe.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/13810954303.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/38109282767.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/xavagupukekataxorezove.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/xunafiwipakiriviga.pdfIn PDF document text
    • https://zagi.hr/files/44077711593.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d3ec8d76---rijoluxoligakuko.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/wozapukinuxuref.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/9845046059.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/kivunaxaj.pdfIn PDF document text
    • https://10fci.org/userfiles/file/sijumemazutem.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ae42186e---wisegegokivagaxav.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2d39c3ce---datazatajigonujokuked.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135a22ede5ea---zoben.pdfIn PDF document text
    • http://totoumi.jp/upload/file/munozamigunewimakisokij.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a424ac7978---putawulepijaruvotelamino.pdfIn PDF document text
    • 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_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 18072 bytes
SHA-256: 9055bc3fb1f3c68452ab998e1b4ccbe5ecb4e8a6cc37b22378355e126367e65e
font_02_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 10676 bytes
SHA-256: 2fc8d82c748810a9a389584981515b4debd8a2ed96cee678a5f338c0d2b53b09

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