Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4b1531cdb4a733…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 04:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4b0a07ff13a0775a4577bfd98be0c6a SHA-1: c151176a10d1aaba5a1a8ad162f83a32d7b05deb SHA-256: fe4b1531cdb4a7337ae26962daebfe02bbffc5b9e39f91da34e3c530879d1a87
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple links to external resources, many of which are hosted on compromised WordPress sites. The heuristics indicate a lure to install a browser extension or plugin, a common tactic for credential theft or malware installation. The presence of JavaScript and the nature of the lures suggest an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fbbaaa1d---didawox.pdf In PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/4190510276.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740c5d045ca---43688814706.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47923934587.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210817091446.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/6aa690cf960205ebc372bf40cae6d2a3/58165474285.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lovexopibisojitodidefawa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1q7pipr0ahgbtba2cuqmg4kt44/51407981897.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tizukewetirigosegefazadew.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1649811b21---zufidaneweratesizegi.pdfIn PDF document text
    • http://moristas.com/userfiles/files/poxer.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fecdaf1d9ce7687960cc6964516d27ba/wofakodivido.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/29348695458.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/pejupiwekilatev.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/dutuve.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/78846145932.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54690128356.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/54977420109.pdfIn PDF document text
    • https://codecs.roimages/file/bipefol.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/misodav.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/383b8658ac645ce6a4e9d22300db6839/64298876034.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe1768da9---5831545534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=proform+smart+pro+2000+manualPDF 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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 17248 bytes
SHA-256: 23e26265c7e865bbb34ad1208e14660f6196893579fc1fc3dfc05cf58657ae65
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 10640 bytes
SHA-256: 663373d1a69c1193a16b46bc86b20491f8bed074ae26cf0ab080418540c95ec4
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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