Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b67f99392cd048e…

MALICIOUS

PDF

89.9 KB Created: 2021-07-26 13:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a9938c6f2fcba3c99ecec06fa11975c8 SHA-1: 0e0163d3b775199348cb26c8d2133d016972dbcf SHA-256: 3b67f99392cd048e693ba12eb9bbac48f181320213cfa2d8500e1bcd89940b61
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072dfd085145---puveduzojusomuxudimero.pdf PDF link annotation
    • http://sushiyaslo.com/uploads/files/lozakebilivugopinuwevepiz.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/64ee3511141b53f956f25020ec8cb7d2/67238485345.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3511008a---zufotupifonopuwerikixo.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/59946818754.pdfIn PDF document text
    • http://zerosquareonline.com/file/64230713086.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/goxomemijemetivadakijuba.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940cc96d2be---90194184849.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/73279357492.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dd7018eb2d8ae31fe2ff2f22beb92b4a/1279998202.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/56155988772.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nr2sifas788om5nu5mmj6e3qe3/vetexat.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/mugapikalevaj.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991689553c6---97285340645.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/857af05608f15d4d53ddb2d1b069e773/19931108346.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xixore.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/kakorubowusoxage.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e03585c28---rorixu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/watib.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cl0cvfm6efknk4cvbtpu6d21qp/87195378210.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/80039299671.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f5165326---vujotu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a836ee9b---94643095356.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/283cbd3f035d4381cb6706a3dbc57932/wazasiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aprender+alem%C3%A3o+sozinho+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 18860 bytes
SHA-256: 06fc413c63d524dc8cdf676b10828bc843fb446b8d3b2610de1bb501b3c171cf
font_01_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 10972 bytes
SHA-256: 4d0e88b4418f7108aaf8a38179554c83d007bcbbbb33efcb95e9ad4a14ef4567
font_02_sfnt_off00013f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1