Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c43f988353c317…

MALICIOUS

PDF

79.3 KB Created: 2021-06-18 17:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 05ab09b6b7f07a567301195e271c67b8 SHA-1: 386a3a18ab0b2ce7cd6dde6d01b92a028f379a9d SHA-256: 72c43f988353c317b5c4a9ea2e9d25653b62bf8775800c2e94fb48df8ee8be18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ffa7516c---fetopetubix.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/fosukaf.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0877b212c---23729252245.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cb40fbd486d13e2483e44ad50cfc9f4d/votujatikasezusajewubor.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead00e9653---meduzupixozilogabiluwete.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d74a759e---gexiw.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/dilanofiwi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rh0665ovkkbfevmifgrnuf6k2m/49381641749.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/10b29a72669f9346f5e910f1c342215f/jolisukijanigegemexi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5b3286bdc5d09c2adb01928fa97e65da/lijavizilitevudol.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c397729f81---dizoxodejawobuzawagero.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/1564536633.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12425881937.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/xovijiredararunof.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/44020538179.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/vuvitajet.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cd9d203b9524926b76820dc009b389a9/7602720041.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tdmgp3ac7cbbn6a6bcviofl25e/dizopuvetukagomaxem.pdfIn PDF document text
    • http://kede.org/userfiles/file/nazisobagiposiwokeviwow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=happy+birthday+wishes+for+brother+in+tamilPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 5576 bytes
SHA-256: a8863d549782c6f98fd2fa0c429a3b855a10ffea53487325a6046f4944d95e9d
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 2780 bytes
SHA-256: e8564d8ce47447d3caf2efcecc28e4a0d592dad0b9bc789e31dde8c0ed0474a0
font_02_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 9700 bytes
SHA-256: e2ce972fad6f544fe7c4f870249c8a6d6298955f903c93ac28712977b5e43274

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