Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77d5fac46449635…

MALICIOUS

PDF

74.8 KB Created: 2021-07-14 02:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fe0941484e208a827b71dfe23f9b2ca SHA-1: 6c9e0e61f642f18e2c6e62eaf5c7ecb47d32585d SHA-256: a77d5fac4644963538d2994326332a53b73e365251bd7622f3c5102cfe5dbd20
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://thebrownsfamilyreunion2008.com/clients/81208/File/kunusop.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f44b43cc---tukipinedogedigunajen.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/polabetujezimejul.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/7111843733.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/90564129211.pdfIn PDF document text
    • https://tavio.ru/files/file/15007168809.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4cq4tjelvq7437p9l7s4l7c46p/wetetamebemabanuxegen.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a30f0acaa---51917240039.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/nemuwusuferumopodogifuje.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/60767643089.pdfIn PDF document text
    • http://synowka.pl/galeria/file/79527985780.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098acb57e0c2---lidagikowawufakav.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb641b9de2---tokoxeja.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/k0kmne5pibqqt6s4r9l8n8r4df/35461020844.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/88014155327.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/xipabavojor.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6lj3v84r4h93feikfou7gsimcr/kitobi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a020bf3950a---56889427047.pdfIn PDF document text
    • http://vtaky.sk/media/file/84821693012.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/61efa5d7819ad4eb64afe271073be5da/taxonusokesafi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d30d5a3f5---figowexununuvatezowute.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/52147891220.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/83986927452.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/20683684150.pdfIn PDF document text
    • http://hydrem.ru/images/file/64590303475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=romy+and+michele%27s+high+school+reunion+full+movie+123moviesPDF 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_off0000be06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 16912 bytes
SHA-256: 60f049a722e5d000d816d6dc174e3e56b7e5885fafefe0196c1fc87f5cc9da0c
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 11528 bytes
SHA-256: 93ab5bf93d90ecf5f4f3beb9a0f300349c4294395a9cac523ca9db7c26883cd5