Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a4469f80bfdcc8…

MALICIOUS

PDF

79.8 KB Created: 2021-06-15 19:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 163ba63d252fc187792d5d58e4bd9c03 SHA-1: 6741802f31d14417703da665ebddfb886eaa1cca SHA-256: 96a4469f80bfdcc8a9062fd93032578d9bc2d366956697fa598654bb47fa0711
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to evade security analysis and deliver malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=karizma+album+background+hd+psd+free+download PDF link annotation
    • https://abe-rdc.com/userfiles/file/pipanowuvitawilik.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f246f5f4de---24792151717.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/b4ov8re406jp9kpsarvm7g3aeh/64314172042.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc008bdcd8---tekuwaziratuloliruwezix.pdfIn PDF document text
    • http://russia-ex.com/gamajomupatiw.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/16v16f6settr45laouck9dc7sd/fimofazo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d72913d0f---zijijedib.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/40313614728.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/9ad1b9dcbc805ee1d58a6dfa4f6d1ecc/motepekirinobazasoso.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6233826cf2d4fa102f796ea01f63fccc/17636465281.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rj1befhrnlfvja1ahhal61m2j8/liradujobifuliwe.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file/%5C/sogefif.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/159978468e5aedf5c49860561bd245c5/78310487172.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e5211a9b---xogomuferolepetedituru.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/aq7t80koml7i7g688hs5e9rr7c/kasexabumozubo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tekopijuzixa.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/jukesojulorumatorago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011359.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11359 19084 bytes
SHA-256: b2d4f6f736741aec01268a976c7cdbcbea10790c3d3c3cd5247cae1bab19f184
font_00_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5884 bytes
SHA-256: 57bc06e7869e3badb7cc576fd5b79a2f893e4d7c058070559c4d62805fa64ab8
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10688 bytes
SHA-256: 8c5d7702bee9ffb64f324ae6e277475bfb4128e0d3863316c982dceaf7eade20

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