Malicious PDF — malware analysis report

Static analysis result for SHA-256 5765f1490797cf84…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 14:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 719342f5157c1e7e4ad33b8b0c0619ec SHA-1: 66be3b28a640003897d25cef2b28054bec44abf6 SHA-256: 5765f1490797cf84ab44547c2876d5d7d79836deb5a954906785dc1e2d5f70a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://haohanlegend.com/Uploadfiles/files/31855434529.pdf In PDF document text
    • http://sxnqx.org/upload/file/Fl202109162100432848.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jusewegupekusagezuki.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/lugowol.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lasimigozijaw.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c724c82703---fovupizi.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/ac4f82e860493325a1a2377fe60681aa/63715223382.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/fosimovidegulisavagade.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/220aeaa8d633e4416f054db1dd129658/13488956510.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/fepikuxoguzigulik.pdfIn PDF document text
    • http://chinalabware.ru/d/files/68912502247.pdfIn PDF document text
    • http://klinok-saintp.ru/files/rapubilodoselib.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/pulirewowagib.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xekigag.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7c46c43ecf6bdd299b5664f51ea20514/98872401199.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/mudugubimetuxekiwo.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tujasizovurebowuv.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/dusibebediruriramote.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/75904740783.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/numunepinibejebidi.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/podevezerefalekubum.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/gojjibgvfu3mc9cb8rdsfn5ke5/wevonumezitawotibag.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/firilofimoziba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spiritual+laws+of+success+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_off0000af13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 10768 bytes
SHA-256: b26673262d5e87261f7f04999726052021a4d7bfdd75fcb49d52f73e65b62225
font_02_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 14608 bytes
SHA-256: b06f4f80eef4432b474e4ce3618dd0fc37fec5f0b80e3840b548c9718142876f