Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7f5405be4dd8fc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 16:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf146167c9b77db45a792f216b4b584a SHA-1: db2dcaafaa05c37546e74410ab8806cdb4a3f36d SHA-256: ba7f5405be4dd8fc9fd4bdabf15fe9f79309200c59890108feaa161888f4a647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=askep+sirosis+hepatis+nanda+nic+noc+pdf PDF link annotation
    • http://dreiseengrundschule.de/files/69288610871.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/17310347374.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/jenotazarur.pdfIn PDF document text
    • http://stylekd.ru/files/57271880686.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/810998c53b97a9c2a36f4fcb70e75d9a/fejelenuv.pdfIn PDF document text
    • http://secoinblock.com/upload/files/87560758116.pdfIn PDF document text
    • https://digireg.es/upload/jovezibasuvunusimogasomil.pdfIn PDF document text
    • http://health-bridge.in/upload/file/2145731720.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c814def0---4623190282.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bukuzujunef.pdfIn PDF document text
    • http://yongqingtech.com/d/files/dezawenurabosezigunuri.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c73916f2b5a---rizujiwixatobinemazelig.pdfIn PDF document text
    • http://sunway.me/uploads/file/262346557637.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8oh0j86oma8kls17i8ugnma4hu/fuziso.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e956cb4a1c---75759900894.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/043614cd4619a18447854ea4c519e863/91477085723.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252d5e0649---63378458592.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/51055297435.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/kadoruzoralanekixume.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0b4fd0ef7447700f98deaf1209a071f1/xagafineziwusomom.pdfIn PDF document text
    • http://metall-press.ru/files/basarelekosubizi.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/20594645984.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019f1a6396---bisozapapoti.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8204a7030---49047280618.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 18368 bytes
SHA-256: 414c5cd736dd536473d42ab42c54e35f3309238039c86cb6ec7fbbb15b96c4ca
font_02_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 10744 bytes
SHA-256: 9d56e46227d922896476c7e92964a75970378bb1f3ad961962906f8ba21cf8a4

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