Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bb39ebe84de047…

MALICIOUS

PDF

86.8 KB Created: 2021-07-08 17:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b669ef65b867103b5c124abb27159c5 SHA-1: a6ecaff86774a1c8d4efd0cf27d7081de6338353 SHA-256: d5bb39ebe84de047a7f188d87c74e7978dbe848f38836891bab7283ee3c3a0af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interaction via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ost-fogging.com/upload/files/47340416101.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b0db127a---zajexesi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/posojus.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607479e9087d3---zakizisoxodofeveku.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/sibisikutajefebugorogimez.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/gb0o6sr4lq1o6t7o37tu9cp5d1/mikefowulasaremojalebil.pdfIn PDF document text
    • http://bdaudit.ro/userfiles/file/latetoxusosajod.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861ca20632e---27353390729.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91258741457.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/85876868819.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a74dnhe68042sn7bg1jgd60bo1/pirudesedepimusutem.pdfIn PDF document text
    • http://expresskaliski.info/file/29647098280.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3bd855a99360f42facc70cb75f8fb9ab/75168752003.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080eafb141c7---pefatuloxuruvuj.pdfIn PDF document text
    • http://myredm.ru/uploads/file/83104556010.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/buxuxujo.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/nizovuxurerimido.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1m4d8il5t7dahje96l9cot5plh/30814591571.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a13e762506---getudowawo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73185539641.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/surapugeso.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/26d6f41d452192ace2b9d924f31f063a/51751989159.pdfIn PDF document text
    • https://proia.bg/userfiles/file/74940864953.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/92fb6483utqbl7trlt1jg8hp84/16229414794.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/ferar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=repent+from+your+wicked+waysPDF 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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 11172 bytes
SHA-256: 73748f1b78f2ee9d7e1b2cbe75486457ac7f8994aa8287a91c1cd6a9a760c341
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 16184 bytes
SHA-256: d2ae709032fa02283c4fde2797dd904076cc1352c67c38ed27621449a9660807