Malicious PDF — malware analysis report

Static analysis result for SHA-256 c428d2dbd0979f13…

MALICIOUS

PDF

109.1 KB Created: 2021-06-25 19:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5349c828425cc35b8bce6f9773f08175 SHA-1: c9836e03cda4ba7ffa110a15e32cfb0deab8ae64 SHA-256: c428d2dbd0979f13b2dd427b58abf4fc4333db63fdb251b91e2bda407305e081
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=oral+language+activities+for+early+childhood PDF link annotation
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4l4f1lqp4gnl20r6o7air9ofvo/veranetixo.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/funasutekemokobejutuf.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e7iemtfi1hbg308saln8rjl5sd/pajimopuzewik.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07f9741d7---10457701504.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/eac746823df4f868267a3f4cf58b9a71/18147938639.pdfIn PDF document text
    • https://rintrans.com/files/95698782279.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/41405943649.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d08967c2782---veruginapumukunexebesenub.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b022df5793b---kabobesan.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/krcgnc8ddecrotguco3rquudb0/93853296934.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/e8c4fa4ad5587058685b3111d32e3405/zobilozevogurade.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/kewupawofaxetegufuwu.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/v9fhculsalpo2c0285aqt2c286/gilonobafobafusonosa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7cbe9d2e7---kizesejev.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/46761507357.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevigawaluwova.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/d794b1s0tbf17bs1nv2hrnfqi2/vaxozeratozilapi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe1ac1aa7---63914049313.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3b957e4bc75b5688c8178d1be706e17b/nixaloposaperurivanu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ab772e0137ffd776da73521d97b60d14/32925020013.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/jakaxakegixokaxokuxu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/lokezupuk.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_off00014979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14979 16852 bytes
SHA-256: 3430f69d8720a10ba492092865c0a67d3ad718b4d2f2f6e71113de4571aeede5
font_01_sfnt_off0001751e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1751E 11060 bytes
SHA-256: 5f1e7788a948e01d7854856cc0f30a54b7afe771db5eb80d2daccd160c6cd5b0
font_02_sfnt_off00018eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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