Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c58e9b3b47c9a4…

MALICIOUS

PDF

73.5 KB Created: 2021-07-20 14:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d47a626d5ee58b61bb1851422d36d8d SHA-1: 3812d5de7100184626e2afa0e71a4caa7fff1c59 SHA-256: d3c58e9b3b47c9a4f4569c300bb79ee5b7f39c77176053130b5a1c21d7cd4877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains and compromised CMS uploads. The presence of numerous embedded URLs, many pointing to WordPress plugin vulnerabilities, strongly suggests an intent to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae279f7f4---sogifesewegudapofali.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/tefetegoxo.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/79247823967.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/dovotude.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wupawi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0594657ee52397edec30223e40542b96/lukabifubojonutilutezul.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ef654912f---botasozegegedipoze.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a87d44c62d8aef1d9993f33c8d7daad1/80142085838.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac53854ea---gufonuwobimikagoxibara.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f71a5bc6---39457988167.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/50436119721.pdfIn PDF document text
    • http://geasit.it/userfiles/files/50466705149.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/defakolewujolikuge.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/mosukoposijexejeburika.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36979d670c---14228980676.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/wesewutomug.pdfIn PDF document text
    • https://morabia.fi/images/file/pemanuwajinobanavafefalu.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vipevejejuzupegilonux.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/225068ae4365ea29ea31a8fe7a4eeded/pasegupagetagu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e124aab9471---vuxemazozujore.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af0be4f88---56829500854.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/93aeee050718791ac1e732b5a268ac89/dosenawosomufodanuviri.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/38566019301.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/94019123456.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb26e2608---68519165720.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/fugibobezim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=get+selected+file+name+jqueryPDF 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_off0000bc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC85 11044 bytes
SHA-256: b3c3a1873b5f79e76e01a5a0792bf5ca2ad893a34a8b297f585851cd5181192c
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16476 bytes
SHA-256: ff2d5329aacadc7928923327f46771db64601443ab3c42bc49c66819624543b0
font_02_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1