Malicious PDF — malware analysis report

Static analysis result for SHA-256 43742332bd52ccf0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 12:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 921b51b588c5b12d57b872df44d67e46 SHA-1: 8d950735b8d086163ef2d5885341d42c810624c7 SHA-256: 43742332bd52ccf029c44cb1d1f572deeb9ac3880d11041ccb5bb075b6bbbf99
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites or are part of a link farm. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick the user into installing something, a common tactic for malware delivery or credential harvesting. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • 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://tablica-nieruchomosci.pl/uploades/fckeditorfile/88622581419.pdf In PDF document text
    • http://georgekoldun.com/var/upload/file/duvasaso.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f63dacddf22e19c7179a3abdda2ac12d/91496271390.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/pubiwegiwurus.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a519ffe5---wotiduza.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/pekifogemerateniwajugibam.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/36090480891.pdfIn PDF document text
    • https://khanikango.in/file/joviz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rrljg1uhfs2qphkn166e7uqa3d/62396013761.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610646b731c25---pimorogokebepujexamevebo.pdfIn PDF document text
    • http://lamay.de/userfiles/file/pazap.pdfIn PDF document text
    • http://aimic.com/userfiles/file/vigufagasilorig.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/51699556009.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d9052ae4be6f6bcde7a4c05434ab67f9/nafiledopekikej.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ts0cbctc89ldcq8ojbcpft805t/24521680855.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/50975cb173c624f23b2bb23b86fc4195/fetuwon.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/soviwuluwuribapofiwagis.pdfIn PDF document text
    • http://abwessex.com/uploads/files/30665604005.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ou31pitv57hfp2u54rm4pi5472/zagapironuvo.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/dimixujafivobexem.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae373bd3ab2---lefonasefisilifireviso.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440d082f6c---40426997231.pdfIn PDF document text
    • https://luminex.pl/upload/file/binokedox.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/rojadosejutipa.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/d2c992abcfce8b7c72463bf43e6b2ed8/70648280469.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/77247215282.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/78739927653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=material+selection+for+thermoplastic+parts+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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10880 bytes
SHA-256: 1ddb4e52b0ea4406cab8ee9d0537ef22a05e2935adb3b4179cc3190d318ae485
font_02_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 16164 bytes
SHA-256: 0e5e89d9d51f4f862c17b43b06f136b0d1454b17a6dc0c82e097b687f35ad3e4

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