Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c96a414d79687a…

MALICIOUS

PDF

83.2 KB Created: 2021-07-28 10:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a601767a89190870e0b17aa3ec78f407 SHA-1: ed55e77ddbe0d5b3ca42430d67e3f6f1761799cb SHA-256: d3c96a414d79687af342ed08709db2c47d6f0475a2a7ca254cea7b9f4d9fa8a5
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves tricking users into clicking links within the document, leading them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7286

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc64591bea---wakuge.pdf In PDF document text
    • http://dzbnf.com/upload/file///56177446263.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/valejubufavetubefejanapur.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/sudab.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/xiborik.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0ec50564d3c4eea09867a688c922b858/ruduf.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12218467489.pdfIn PDF document text
    • http://landia-print.com/pdir/file/88540011264.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zuruguxate.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c939ff498b7---5202849419.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b2b8eaf65c57f58d746b320c9ebeeeb4/4351259649.pdfIn PDF document text
    • http://ledins.lv/cms/file/lemarupawalumivomajazo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210627182031_uksotv.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/72888168098.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1f201f503979864197a303c4f6f263ba/79350616109.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4s00pdtvfl1qaa3rfudgiaqcqd/68201211358.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210714_24136D781EB7B62F.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/guxefab.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c7c133116038295a13bbd142ab7625b2/34724090263.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c0d5d9251279c8fea2ddfca0e29c6864/pewiwuwenap.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/97001673208.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853653fb98---51089738657.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180486965e---86468354685.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926431bfd6---53672873804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+are+the+assumptions+of+classical+economic+theory+keynesianPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16596 bytes
SHA-256: b26fa4380d4a75fa3d0e4355ceedce459dc1b08167ad2c3bb30f2e45499174ce

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