Malicious PDF — malware analysis report

Static analysis result for SHA-256 984c0a161c1c003e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c0f8e4db195fb5ee7ae48db34f7232f SHA-1: bac484fc7a1e44ad7ccd3257f5e83cfb8f8a91fb SHA-256: 984c0a161c1c003ee25cddfd04732066846ddc3a30c7c0f5b91a53ed185ed036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting it's used to distribute further malicious content. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f07efd1f---roxulovisodu.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/12c2a79cf9715cc433998a12a6d30c0e/javugotagatarunilubunuro.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c197e75fc8---53618244684.pdfIn PDF document text
    • https://majubesar.info/contents//files/bivuzuxofavunok.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/fobuz.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/71905949281.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/10002788535.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160847aaf2fbcc---55298327854.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/95512908162.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/48efafb1536d086987cb3408a953c82f/79356712834.pdfIn PDF document text
    • https://bio86.net/fichiers/zutizarofosa.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/98288484152.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5bf5c208---sirotiluvimexezosekuwebot.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/22627689336.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/19769883424.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d05daed575de6c4b1d521b739bd3d1a0/58424058106.pdfIn PDF document text
    • http://kaies.net/upfiles/file/wubajewod.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/ligilerorabivusulimogivi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070646ab29da---rodadasulel.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/gesixo.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/36395659123.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd816d7f34---lexonutisifuvog.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3onbmsik1o18ijs0e2g0bl7ka0/12922929309.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7c7ce7a0---33954925478.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/59bd2322e3562fe18144c1c6d60d860e/37181591353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=engineering+plastics+and+plastic+composites+in+automotive+applications+pdfPDF link annotation
    • 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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 11112 bytes
SHA-256: 77a00b1ec503bcf571d03386e031516f3c18cda1f422edfd89d8bacc331834a7
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 19044 bytes
SHA-256: 3a55d59f3d6f543acce0fca22e07c8df8db3add68f487b641c84317ebbdc74ec