Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae0d086e518bc85…

MALICIOUS

PDF

83.1 KB Created: 2021-08-31 11:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b4e75474afb7fbae7c5037b88db0275 SHA-1: 88b2c5838c4e16946501788925c77f0811f9fd7c SHA-256: 4ae0d086e518bc85aa44188e047332ba22ee7c92c0039adcc4bc30de1114654e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm is a common tactic for evading initial detection and directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/fugevasewodurefut.pdf In PDF document text
    • http://hainescentreasia.com/images/file/rowifalinezusevagufolajer.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d629dc5ab77---84985936413.pdfIn PDF document text
    • https://pellevah.com/upload/files/42526639206.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/kekonudofavatederoduzipux.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/30646693946.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb2eb30ba---86141031351.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/68140278941.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/uevqo3ki39jd446cm8uojqj98e/midukegomibik.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/dabuseteletinawabarov.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d269193dd46---butenibogakibugulojaxu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fakavaguti.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607992da1cca7---pukaso.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/monanaminili.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9518a9a76---40357372337.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/keximopegulizivek.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab487ec7113---videxufeputubugovikip.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/96404830837.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/52951028470.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/67664501658.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772db4613b---65678530214.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/37873363744.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/51995757425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=76+unblocked+games+among+usPDF 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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 10876 bytes
SHA-256: f148c12b7e1ebc412e4f8240fe2f5a081ca7af4a7a9100118fd91997992144e3
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 17924 bytes
SHA-256: 26f1813b7da855e6b2efec01cbe3474f5140ec9562309dbb38e9cd2029546fd2

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