Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a25713cacaec8ce…

MALICIOUS

PDF

88.1 KB Created: 2021-06-09 07:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 265c38e900e779b62e9961e4aa4d0c07 SHA-1: 2ed668f5b761385c5150de154d17ac7947fc1277 SHA-256: 4a25713cacaec8cea688d36d075c063f0063da9b67e1dd61fc91d6a4e3216190
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm hosted on compromised WordPress sites, with one URL specifically mentioning 'download badland brawl mod apk', suggesting a lure for users seeking game modifications. While no scripts were directly extracted, the PDF structure and the presence of numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/uplcv?utm_term=download+badland+brawl+mod+apk PDF link annotation
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1cd35ed73---35145368669.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f2224e6d---34758905845.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xoduxekivo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1abfe1cdc---vafejeman.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/029d18dfd6f7e3af2bdeab7204812d53/saritufosevedifox.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7c3c36b1---nomezexokivaboxavovaze.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725149f2efa---tetuxoduwojage.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fb6e37f533ba07890c86953b49380b26/6184386015.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6bea7fe26c5eb88e189c7ce09560190e/47505836695.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b697511c---guzesonaxubategagivufasu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kdof64r3lq5ef7gsn99ekbdbc7/xopuxeboguwoze.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc075c5cd3---16987820825.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122fc68efa---22693143065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3620583ed---folutupera.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://scripts.sil.org/OFLIn 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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 5220 bytes
SHA-256: 9b3d450ae0533b7e0e7c7b6fc3036a9bee840141bcad28c8f99245908631bcf5
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 5704 bytes
SHA-256: 8bffb14df1074c0ba00dd415de94317998295341dc90b4ee2d6c7dbc2259a307
font_02_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 10680 bytes
SHA-256: 6d3c0618fcc64672d306281e23e23d75340c97db6b348a480d1422cb710497de
font_03_sfnt_off00013b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 16208 bytes
SHA-256: c286131fd4aa28075b5e406c559e01e688b1a0c136de28944d919ba4dcdd9e4b

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