Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee755e3757576e8a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-25 11:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94f1f81856f1b7cb99fa29152cbcd7d2 SHA-1: 73ce0b4f74cd4dd5328ddb6f7e4448e813b90af7 SHA-256: ee755e3757576e8ab5818bb19eec60a615e142df6d27835e756bb3544cde0dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the compromised hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://queure.ru/uplcv?utm_term=signal+private+messenger+apk PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395da2e49aa---bipexuzegej.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/354588655.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/82474675554.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/warebizuwudu.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/86422715438.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/85158488563.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/20086988225.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wesosetujaba.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/katilowifutezabodeja.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613befd25a13b---52879681669.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/9037327153.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tofagagil.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1632160991.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/pilebinegawinitafu.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gubatafenenixer.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jozulofafobexafez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093c3a234a---23384815291.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gutumefujodeb.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/48318137237.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/32687410509.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/siwijinejakakubesosumokus.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/tavugelorimovubafezabut.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/75824025072.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/bumopumupu.pdfIn PDF document text
    • http://mqskin.com/luutru/files/xajakawaremanik.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xurorijuvonapes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 17692 bytes
SHA-256: 0cfe683bb71c9d7a48b7469d2705fd063e8bad8c4c37ffebcd58b36f436bd4a5
font_02_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10708 bytes
SHA-256: 6f421c0776db35622fc2692948181967d3d376be710466510b742db28a89c4e7

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