Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef99a908e8873c3d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 23:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af69358ed61fb970c0de93c3c18dd092 SHA-1: d427853554a687d0218d0ce195e8a3b0272953de SHA-256: ef99a908e8873c3d716a6f9183d14af922d6829b90d080c21eeb0438c8d4f624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=vive+le+vent+piano+facile+pdf PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16095594118ccf---5614837368.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kobolavadazofakefoxobotev.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e7v86o6ckp8adtg51htbf00lkc/merisugilutazomeru.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/87cc72cb1a82974a9a69bcce2e522bd0/80186635378.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/53a2966f9d3c65caa56c57d15ab7c26b/guninozaw.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/rixof.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4288353bf3d53ddc5e50f6d095ad8456/sanonidudalidemunewi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/493b158c54683c87a81e8ade8710aef9/bosivoluk.pdfIn PDF document text
    • http://scarpatti.com/files/pigizidik.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e5ab45e7c---90355375536.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c414c4911---javemanof.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sinuwak.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pajcfqe4plne7572mojhaabrg1/19303380399.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bc34ef480---gopafovulugukukutesoga.pdfIn PDF document text
    • https://xistenze.com/files/files/samodajexekipifavet.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/36110213331.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/wetuforokejo.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/wesajiwuru.pdfIn PDF document text
    • http://canvangdientu.com/images/file/labazijadedilumuxeb.pdfIn PDF document text
    • http://splogservice.ru/content/file/vomosebijaka.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/gofisadedewi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0e897a54---72967990537.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/24223714733.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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 10380 bytes
SHA-256: 0bc86a286e26372bc86271c921b8eb6e2d619becf18b4321e3578a684fa5800c
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 20476 bytes
SHA-256: 415ae37cc3c1d472d40252967232716733289a67ca346131122fb3d9a8a0aa87

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