Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b13310153e14175…

MALICIOUS

PDF

78.0 KB Created: 2021-07-06 20:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6f2c56a24dbfa196fd09d3b0ba70378c SHA-1: 675ff39588f87258bd41dab4463e45b15c340cec SHA-256: 3b13310153e14175b1a02487f6323aaf9b02c3de792e97c5d7598209b27217a8
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates it may also instruct users to open password-protected archives, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lalinpress.com/ckfinder/userfiles/files/regaxomatowutevamuwodagit.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acfc9b4cc---fipewabowagumex.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/bexezegigogosatajekuxavor.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d85a997eb---15595816776.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/15234617625.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/af9m2102cvq6tg304dfbcki1o7/jukidiwo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/65e3f21dbcf406bcbae8aee3254e9766/6216029154.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfba83424---44887903691.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/9515316821.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/21376750418.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/30919197841.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/xesoneko.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjvibqrhduiqm30i9j5qnp62nj/18941060072.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/soxupozu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4222a75f76c263b5e204ac10b1a401a8/navisitakebuwa.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/51eea4de8d282ad75bfb32eb3bab9c37/kizowomiwag.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8lie8g4c9eie79m2ac3odqvu71/jevitadoxatukovap.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/fdfc633da992b22f1584db5fde7b7621/nemukutiwesoxotegona.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/62185273302.pdfIn PDF document text
    • http://www.toptehnik.si/images/67741349488.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8067035565.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/zaruwani.pdfIn PDF document text
    • http://whatdwellswithin.com/file/82691134043.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6462732c9---6195997301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tutorial+for+autocad+2010+pdf+free+downloadPDF 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_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 16712 bytes
SHA-256: 2be64aa7efabe70ce7bc7de9c8fb2f783142cfd8593b477ccc70b8bfe4791b3f
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 10888 bytes
SHA-256: 555242651b9171fb5279fac264f2ffc934b700731f8492af4122b9e48a21180e