Malicious PDF — malware analysis report

Static analysis result for SHA-256 222f59e7e278fb38…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 19:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dac3b0c4e899132bac4c4da6b6825efd SHA-1: 8be1598261d0cff8bf63fd0917e10f5d9c11d306 SHA-256: 222f59e7e278fb38da98a21b45d5b01370dafa8f79ba14310dfbaf27c21b1913
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://przyrodnik-kujawy.eu/userfiles/file/lerotexofa.pdf In PDF document text
    • http://resurrection-life.net/userfiles/files/85799822645.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16148becf65071---fiwozebotekek.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/86831145579.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/33184270171.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafa431dbc---vefez.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/37119461539.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/2159066708.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/72322367276.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/rikexinewepedusujan.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/70027404609.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/86299131732.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/bikipikowewakotejufo.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630447025_da67b78674.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/rifavopolok.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/relilukovujak.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d566d6ec9965cf0b79a5d61747f18102/47692130198.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/tudemix.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/58002207037.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b9dc965e64409e4dd2021a744f57acff/86134643289.pdfIn PDF document text
    • http://flomojapan.com/upload/files/31578402406.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/fejeminajomozuxagogovak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+outsiders+study+questions+and+answersPDF 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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 16352 bytes
SHA-256: a61a615ba63f0d026c8d33932642f3c2aa4e52d15cdcb4bcfc68e6c449b4cfac
font_01_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 10708 bytes
SHA-256: 65450ac1a020a3df7f2ef76a5c8f23def083f6f883af2b59b3f26c529dffe94d
font_02_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1