Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f47df13ff50aa8d…

MALICIOUS

PDF

79.0 KB Created: 2021-07-31 23:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f93888718660b11abd2e8f7fd4033612 SHA-1: fe720f620f4b4fef58f939c2907f46f32891700c SHA-256: 4f47df13ff50aa8d9ddfca59f2fbb7ec2f0c9e58b60793e9fbb25fa8edcf17eb
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised websites, many of which are WordPress installations using vulnerable plugins. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 5

  • 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
  • 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://beepost.vn/upload/userfiles/files/61410307144.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb21a79b42---denag.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefcbd418a---nivafamizuvuk.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e18a66e78af96cd19bec16d68c6f71b0/22287363472.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079674915e94---kekegifeterav.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/nljnkjrj3r15tueh67lo4madr9/nipafer.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c463e1759e9---turarokiwaba.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/xerotagatejejixo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a80c3ce115747541504106ddeae7c972/1211422465.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7ffa1b137ae7ccf3c116d97107b3695e/wusufirewawegegoxi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/70976540375.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/eeda2f58ef7d92e2cf45fa81d3009a44/64498875637.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/4605957606.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/lokifezakekoja.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/batip.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zevolikevux.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210628061800_95065643.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kewuvisujuzopelejapegizot.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bf5cfea2---94962908653.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/bemejixi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af2888b7fb0---1889829806.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810a5f1a2dd---96777278841.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/40833737267.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/bavunidutuju.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/likatol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=who+is+the+most+powerful+character+in+marvel+future+fightPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 11172 bytes
SHA-256: 4297a617adb9a58d1a3ecb2822767221b76b16386ad8f32f4be02ddc34c75ace
font_01_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1