Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1905fcc2ede542…

MALICIOUS

PDF

68.5 KB Created: 2021-09-05 16:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9e6af9df925d6c6d35512012b82d639 SHA-1: 403f56c56c718cee55fba4a119eba89834cfa9c0 SHA-256: ce1905fcc2ede542c8b84ff36b29563dda1c312f8948f119213c86731f51827f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various compromised CMS upload locations. The presence of multiple external URIs suggests an attempt to redirect users to potentially malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://ketchas.ru/uplcv?utm_term=haese+mathematics+9+pdf PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926c565bd4d---67983573135.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/guzezosulato.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/kilam.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed922e10886---21083593960.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3d6638c---91967081324.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/17404273887.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tepukoxebosagaki.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/53364307958.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/51c03270d11c91bd9ce437c3ddae00bd/piroxumowolegivil.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/xigujizolum.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce674dce72b---govolobidu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/827f05fa1724d4c3bb8c1983cc97beec/84432002243.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/89117913866.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/44905223606.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/65667141467.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f7c8ed35---99260509261.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/matibudebilipi.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/veregil.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9929ce81---kigigavuwunitomaduful.pdfIn PDF document text
    • http://jkohut.pl/file/19736131905.pdfIn PDF document text
    • 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_off0000b137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB137 14084 bytes
SHA-256: 4d5b058d57ee60724fcc1e01ef2fb1a82eb6cfd66c369455842a1e28fb1274df
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10672 bytes
SHA-256: 8e3b427ff5528a8540e007aa933f6ebc52afb354ed6e3810649f98daa99719c5
font_02_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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