Malicious PDF — malware analysis report

Static analysis result for SHA-256 204760e16848c9af…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 16:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0fa6f61c23a250da63932378e79553f SHA-1: 925acc17abc170f96bc9a711d7d6807500103935 SHA-256: 204760e16848c9af58f28277bf14c1bfc3e5d8e8ef5d2ceb8c4cd5815e20d4d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that directs users to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=bodyguard+tv+series+watch+online PDF link annotation
    • http://altus.pl/userfiles/file/wawopadexunijatufobafa.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/16264210762.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/difubijojedujude.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/18098387294.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/12619876405.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/29585638498.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozir.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84966364601.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/junigugakatusave.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a9fe2bd8---kisusabu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/57420404004.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161341478915dc---12551808711.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/36694599502.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tawomavuguwelorumitiwab.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/816df9322dee64c3215b94ec65599059/wazososekope.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ae4419aba9---ravuwimasavaferepojebeziw.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fawimetuvis.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/malap.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a8ad62a6---22890041982.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/mukuwexuja.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/nuzemu.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/fujedasexasamadipopasek.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/padijeka.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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 17464 bytes
SHA-256: 1c2b87eff83ddca794cf7617646dd76b6f9a902cdd5b000dbe219f446405786a
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 11068 bytes
SHA-256: c9a1fa8aba6683b11103ee2d3717690e301edd581f91c3002af5cf5d96bcc584
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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