Malicious PDF — malware analysis report

Static analysis result for SHA-256 021c59b1f09524d6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 07:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a4abefed4fd87425df22e0e1009e3a6 SHA-1: b1b151b5fa5caf9578911ea32211a57189c050b5 SHA-256: 021c59b1f09524d61d26559edf321cf07090970232edcb36a8c3440846922bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, pointing towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://catamma.ru/uplcv?utm_term=anaesthesia+for+cardioversion+pdf PDF link annotation
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/57340491690.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/58323053739.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/47acedc5c2b7bd05ec1d77addda9acb2/fidixezivo.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/25633394616.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/todetulinizepir.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/wekuxoxatokumusopi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/246631f19aed054ea159a538397c4d46/17280777915.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/73418989486.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4nut0r0f2n0t0qndr8ji7m78co/46859556504.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c633ba403fd---28939007079.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-25/20210625064351449630.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///foburesagunakejarik.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/95546820992.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/18042796208.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098475bf288c---28173020219.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/vifiropedunadadilotir.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/saxasubegojaraxax.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/4746828273.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d1bhle6vsbkudafd80l8cchfp5/68284414166.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/xokajugurokubozufufariwav.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3kveucn3075ps7qj2ai8o9t3p6/badujipolozuzimasuvuxejom.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/50558478739.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/85d1b3b709852f2c9e4ad36b332c5853/mizalusedoberi.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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 10716 bytes
SHA-256: cbc1ec61eba6550468346754107338c0227f8e219e976760d32d76a5e406931a
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16936 bytes
SHA-256: d6f1e2d8d682b2ed0b764e550601a17639d8b12052af6cb9537f0dc9b5d20c3f

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