Malicious PDF — malware analysis report

Static analysis result for SHA-256 72952bf32be3e4d0…

MALICIOUS

PDF

94.7 KB Created: 2021-07-25 06:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e4a9b1eb63609cb48079f0364b3533f SHA-1: a7e778dc4f1c0b6cd3f49395f7954897668da8d2 SHA-256: 72952bf32be3e4d0bfab625f972d4eec01298becb58fbd4a1ba21c6f9f5aa357
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of embedded JavaScript and external URIs pointing to link farms on compromised WordPress sites and disposable hosting suggests an attempt to distribute further malicious content. The document's structure and URL patterns are consistent with a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://happysmilecard.com/uploads/files/gamesozakuwodunifusesukar.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/prdeu4hqqihhoivg1j8g0rqbj3/nimiz.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bomuwoxubojodagetewixef.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/84866228951.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/48706903119.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/avdodokn9n9a90ku95m13tf4hu/64314959123.pdfIn PDF document text
    • http://protok.pro/upload/files/32582644055.pdfIn PDF document text
    • http://getem.plfiles/file/mavesebim.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xesonobumanoxagupenebol.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cfc09d87e---roginopozafupofupivejajok.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a347e691---pixosofora.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0459822e9f6ef2260999109b884e6428/51402134200.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-2/20210702045240576842.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f89b12245e3---86898621768.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gitito.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086343384f4f---92750647460.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/47cc149b495f104a5ba1753597a298b2/borinupafisut.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/532bc95538700689a414547f6f856a8e/nujotevusidarewigu.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/74414095954.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e65c69b6f---2625066109.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/850f28ee958a656d1e784a7a65f13e3b/14832674932.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/61951961692.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/94aac4f240c5ef7b685df9888c55468b/xedagor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tamil+comprehension+passages+for+grade+4PDF 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_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 17924 bytes
SHA-256: 8686d0b31aabfdab290359ef434f95ec3b638b67cf45c9913754b6ae81e62349
font_01_sfnt_off00013990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A7 11008 bytes
SHA-256: 59add50f386adc65c1db7d0f72c4875f40b1b950ad2e9d1dcc512aacdd21efd0

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