Malicious PDF — malware analysis report

Static analysis result for SHA-256 101c2cc8949dd90b…

MALICIOUS

PDF

72.0 KB Created: 2021-10-02 12:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8465ddd7a6e1dbf1ef22ca151579f532 SHA-1: 50d5f0a2bcf21f5c7cc012c8eee3b2cbfdbdfa4d SHA-256: 101c2cc8949dd90be568f960d45bb08067fae5ceeb04c219635d289b74d0a9d4
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=how+to+convert+excel+2003+file+to+pdf+format PDF link annotation
    • http://puginternational.com/ckfinder/userfiles/files/tabilasakon.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/49204437456.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/nadipubixafon.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/zubitobolipilon.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210901120550.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/dukiramuzofadarila.pdfIn PDF document text
    • http://liluby.com/upload/file/zagemunufajebijon.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/19710197385.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfbd31860d---27921397288.pdfIn PDF document text
    • https://davnosti.ru/upload/49701755076.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5cbf97bd0---88740193358.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bunafigudi.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/tukurepogogiso.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u9j7k35kglp8udihb43e89clk5/burebugujabapaburakije.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/00a480631224c4b729952b9d0b1f08ff/87055160265.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/87603034827.pdfIn PDF document text
    • https://smilewax.tw/uploads/files/202109300728016777.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/39926221558.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139696d8fe7c---47241488925.pdfIn PDF document text
    • https://subarini.ro/mm/file/zodozizu.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/rezugupokizobuv.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4a28ea54---zopomudazuxufojawigofeme.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwof.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nasolufulerurakabunanib.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_off0000b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 17476 bytes
SHA-256: 143da5aa99e45151c2c85517f864818132919622d8c83740fb999fa417ad7215
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 11272 bytes
SHA-256: 81338c6ab9fc9559631337f3cbc0b80f72ffde77c439c1d44619025b06d121f0

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