Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b2e8593e9d984b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 00:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4876a6c53049e2d21decca95c7d9559b SHA-1: 2a391f46f4c33f4f586e1c89215b4f736d186f3a SHA-256: 96b2e8593e9d984b710ff6c35770f94a4e9a4b3d79220853063bb302c0d4425e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the extensive use of external links is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=hs8381+interpersonal+skills%2Flistening+and+speaking+manual PDF link annotation
    • https://rm-parketi.si/uploads/89819750530.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/xamopigugo.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/92828503857.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fadc0c9c188a6e295fc6ea9fceab001a/maxodororelezi.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210726173638.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e848753a3---sijugigipomexevit.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mqi2bji4g9o91odt3hh5j6l531/41468858639.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/88875401140.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/xukevodazifafodanewed.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba120517ef---desuloz.pdfIn PDF document text
    • https://stvorki.ru/files/file/66997181666.pdfIn PDF document text
    • http://goldmustang.com/files/files/wujara.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2cd78bdc---dowopafudet.pdfIn PDF document text
    • https://seikico.net/img-tym/files/bikasirevuno.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/stps7lguff7tknrimmurfnvf2b/25882718234.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/48673888021.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093d45da8ae9---wepurinesevawebiro.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/56647111658.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/67389939005.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ed1bf471---36091284253.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/mozekixagitu.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/17936309285.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/35241673271.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/78293523331.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_off0000c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 15752 bytes
SHA-256: 4a417955b371e1b1329dbabf4b69e3ccf4bcf973474b1982bc70f11aad814213
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 11384 bytes
SHA-256: 5445ad3e11613f998256c10a2dd1b68cff60481f74ed397cb3c092ccf995e01d
font_02_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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