Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d75ebbcebe6b33…

MALICIOUS

PDF

130.5 KB Created: 2021-07-13 21:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79ff187cc82a9125f4706ffba8d41897 SHA-1: 0aa836a4b03dbf6ef0878e719cba05b77ec56405 SHA-256: a4d75ebbcebe6b339f836ffe79562941777be75b1e6498dc62ce026b7c6cebd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, specifically within form upload directories. These links are likely intended to redirect users to malicious content or phishing pages, serving as a lure for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609e728ee082e---65443165808.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/csd5etcp1ooe9cir20e7jrak42/rapavevo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e28d3a41c1509b065a3e963b9daef80/dewewalitubavinuvazili.pdfIn PDF document text
    • https://norservis.cz/files/files/gudavufogamitajawak.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63817eb2f1---37745174388.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/5651677643.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2db809219adab4c800c5e695d4f70e47/58940898726.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6cd13e0b---serupazorososutibud.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8277dc6ca4---sepefarexesogilugipal.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bac10eb0d5370f7201a5aee3523507c9/wopijurepurodazezi.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/90686800196.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a780d3c4358---fudarigoderatavatopofapa.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/mutim.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bcef1872---44467497715.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ff290c2c---90534033297.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3082fd433efe5d84e9337c39dc30fb68/xivamumaruted.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/62ec151ca2774b2a22003250c267214a/69517146398.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae23ddfef4---72526975223.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/057665851c7baa4966d9a4a594900005/59278300693.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/21340930235.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/fetopotov.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r17pnkppmhd24mg3vueejbv8cj/lesonom.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4926ab925003da34dd26956438e67733/lujadogipukexidekexovum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ending+a+contract+earlyPDF 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_off00019e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E41 17760 bytes
SHA-256: ca39a1d466503a027a22af60c7407d0527bf04f0bdec5d57fbf476ee9221b9a1
font_01_sfnt_off0001ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCB1 10472 bytes
SHA-256: 69b72bef5f3e3735e69d301055644ffa5502582d19aa50f03787e2a9c8896038
font_02_sfnt_off0001e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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