Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11b74f37bd5ba1d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 14:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 956ef2b3e0a143b14e7416a56048720c SHA-1: c2f65ca872808fa5ff281323dab128a60e47e09c SHA-256: c11b74f37bd5ba1d598f87b22bf64f588844bfac526471e10ee7c2471ea8b3aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to compromised CMS uploads and forming a link farm, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=physics+a+level+ocr+equation+sheet PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9b89e9ed6---javarisobelotopos.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/70209307202.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/zozebavoz.pdfIn PDF document text
    • http://bastola.org/userfiles/file/giwekelixifuxizojidili.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/lazobuduvamebabewi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145df4c7bf00---derirunivopewomuw.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/35294094362.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a24e8e75328b94dda87d3dfabcba1ce6/pomuxawozad.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/nuzotovixev.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/29553770874.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///61445607295.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/83206010919.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/77240828927.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/tudati.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/82602461783.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/40609913010.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/teravemapidotebu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/36494237887.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/83140409863.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/85824615800.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b5e8b0d3---61955166669.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/ruputapetasuregawunufafov.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040001029122.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/5690776301.pdfIn PDF document text
    • https://anandalaya.in/resources/file/5590483722.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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 10756 bytes
SHA-256: b1f41de4b6f35989c085eed8868019a481048244f5a78ad9b193e254eb9d6968
font_01_sfnt_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 15440 bytes
SHA-256: 72d794bc669362f0d40becc33ff931b2be664b18ee25bcb09cc0f51a1f1f0448
font_02_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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