Malicious PDF — malware analysis report

Static analysis result for SHA-256 445fd6583de0cb3b…

MALICIOUS

PDF

83.3 KB Created: 2021-07-14 08:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0af791235e380b69034408577b0a8df6 SHA-1: b069eb3e300553221005323420ca50d515f31b8e SHA-256: 445fd6583de0cb3bbb596f434a3255d990147aa0e936dddc6b0d250755984114
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. This suggests the PDF's primary purpose is to redirect users to potentially malicious or SEO-manipulated 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://aptitudeclass.com/ckfinder/userfiles/files/19012894627.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085de4557e70---tivaxed.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/mexude.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090edff5edb8---pulusanade.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de0363df5---63923819609.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/wopalejixejotojakux.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75755415246.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a7b2e43d3a6650e6b0f98b098996a054/xejigaku.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/1205800822.pdfIn PDF document text
    • http://nenorm.com/files/files/magotorolupat.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7c8a5a4f946c93339b20184af7403f74/62273482561.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/32174717351.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/waxaremulex.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba070f31b9---3745275499.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe260c2c6---49029160683.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pivisamugi.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/rulajetizejurew.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8c0f4f81c40248d77fbf570aad967633/wusosusibun.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a01b908b---30891362881.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nifarexanivekavofolozufi.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/66169220321.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd2b90a9e---fanafavatuxujijerofotuged.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qtog486nf10budpdvch5ukcv95/towadenimuxujedokumasaxog.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcecb3a0e---fuvoburimoranodoxot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=difference+between+an+acid+and+an+alkaliPDF 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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 16368 bytes
SHA-256: b4071affdc428f70f01e144a547a27c2a32f88838f6a0112d87357a397ab972a
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 10500 bytes
SHA-256: 6c4b07c02f6488be469e5249adcaac939488e731d5dd40fff261954eaea2913e