Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2385996107c63ae…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 01:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d3cb904d22daada28bcd12c24b07907 SHA-1: 0ec54ebf7a3f4667ee7b24307500d47b35034b17 SHA-256: a2385996107c63aeeeb3e0c021685233e6cf79aad67856127b60fda330767175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=schaum+series+c+programming+pdf PDF link annotation
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/lamolagovuv.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f10f7ec62e5183676d6dbacddef2bed8/69324005692.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/lapilamisozuwumiburugeta.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1011eeac132bb2cbf0ec13d7e3a121d9/maporowepoputurobeki.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2832f20d304b94d98c8d4266b2f582a5/16763390935.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/51158496093.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/83868965453.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/38980608015.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/kesexewava.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/86268783093.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/46372787634.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/xurukiwetugasaj.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/31183745315.pdfIn PDF document text
    • http://popmetre.com/news/files/losekudu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/58187478447.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/39566884600.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/6747319542.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/sozejamezowuv.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d0361604---tepuwakunotibijof.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/81602734708.pdfIn PDF document text
    • http://pronobile.de/catalog/file/jamanexajetal.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/25958871308.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161362975b41f9---lakukonupeb.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/jomibedabubatuw.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_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 11100 bytes
SHA-256: a0b693d6f23845f183ce51bbb887b939d42445e1404db212db89723c90bde385
font_01_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 16996 bytes
SHA-256: 3d97ac39e7f824ef254295a823cd773a890a7cd88352af352ec4f862b67d651c
font_02_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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