Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d892b5f5498b74…

MALICIOUS

PDF

83.0 KB Created: 2021-08-14 23:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 95ea7d51e0cd49a36cb324e7b5f03ef9 SHA-1: 160357e042c6a7a23cb0b7a9c170b1dc194af82f SHA-256: 85d892b5f5498b748de93896caab7f23ff593ee0ac542e28dc8e26bba8596663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/22b533fd02b07cdd901562d486494091/musiponusamapokusonobiwim.pdf In PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/180691c1e1b7af279e641eff5225659a/xezafawan.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3569e485d405258d882f8890e4e53e62/pajalukasevili.pdfIn PDF document text
    • https://micsys.in/userfiles/file/tugegavomof.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3c6c35ad---29885564566.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/99470678341.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xufobojujipuli.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ee7f4947ac383687008952188446b6c/mafiwederazabalewaze.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/8c4qbt73fu4r315kaeiupjoo8i/gonubowuti.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804fe8a510f---pevowumara.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ec7504040---sizidus.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/39708595396.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160baab1a87e48---xipizinakaroniziruxef.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/geturolozakakefiwemexavuv.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/famibilimivirup.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/8296826521.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160909c944d7c7---zinizefipej.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/73061496306.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/jojedomakot.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/lokorudofopamuzapabi.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/89250743122.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777059b2566---42667813755.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/bd7e6f3d4667608128bef9e1b8c9c7d6/17277342073.pdfIn PDF document text
    • http://vodnik48.ru/content/file/pesekoxed.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/87080587731.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/94930053047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=asus+acpi+driver+windows+7+32+bitPDF 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_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 11176 bytes
SHA-256: 7ea7e2ba398aa0c91cfb93aa5348cf5e1142d23022633058a6e0a39950b5d680
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 22716 bytes
SHA-256: f8d9ded776c392404f572affff94db44e904c897f141ecd48ea98b4cce85cd2b
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1