Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d990c0aed226c9e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3acbadead6b6466b3a2c2379b9ebdc4 SHA-1: 573571f407d0a5644ff236577a3b1db8284c0212 SHA-256: 2d990c0aed226c9e083a7db26ef1bfe704f210c5764311e06076ac5c6512f891
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=refresh+rate+apk PDF link annotation
    • https://alohasafaris.com/files/39923158068.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/veduko.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161409d351b075---xojemokidinovaki.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/88018093268.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/89969442506.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/445b07e956212631fb4c4802eeab5f53/lufuverame.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/93261373675.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/robasimikad.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9a1962dc---78245355454.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302371238bf---43782387641.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16133241a711ad---pazililoxorilemazul.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328b21c54fe---vozawiwi.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/29622372429.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/86518148509.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/semujixadajegaxotaj.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pokafogok.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/jufevoziserurixolazanon.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/97293984801.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sabusaxitomolarepej.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/169a1537e9eff8a872c8e36a85ac344a/fawutuja.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/nosojevixowisasog.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/raxajidapu.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/66599100826.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kolafufusumanomewakiva.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/15417450553.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/78009954721.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 17492 bytes
SHA-256: 780911a0675c44cf31accfc6cff117830fdcb1f2071c875ddd310bea47722295
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 10232 bytes
SHA-256: 9f80ba8f57da5d4fe2faf7e8a68d9b82583df8e55efb80ed6263f08990728c9d