Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9aba447ce83901…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 09:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db1ade12546a3263239fa0d9f6b3819b SHA-1: 97af14a26db581bbf90644e239d34bde4745c617 SHA-256: 5a9aba447ce839016c425721d07a53192bd6005a7852bf8a6e57704a175dd9e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=advanced+excel+tips+pdf PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ea243d84074d4f1119cf1e3ba88f9f12/nuwomirirowavisagekezape.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/77466997132.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b8281a6.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a4cf28f8dcd775ae3ea8bc3eff9181f8/61719080968.pdfIn PDF document text
    • https://ysh.my/userfiles/file/10535473058.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fiwaxezalusenikifovop.pdfIn PDF document text
    • http://stevis.cz/files/file/xemopakemamakexo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/77488009823.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/74353378284.pdfIn PDF document text
    • http://healthywithhart.com/res/file/71734178595.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/zopewanefasag.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df6fe1a48---74136332079.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/77088420074.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131664106e34---fipaf.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/somizoninerusolitevejit.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/nujalejubive.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6b7cf174a---73543717318.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beffe822b6d---65283858843.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f0598cce37254701cdc2ad014213e418/laguxuxuponoxebijosu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f18acedf0---95088723774.pdfIn PDF document text
    • https://laser123.com/geektic/files/poxok.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/21089786239.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b218b0ad589---zatozuwasulejajupufe.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3571bdf39b927d802c387521b923f3ec/30868418437.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/64038949425.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da08d953f1---32946597193.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_off0000bc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC58 17116 bytes
SHA-256: 5d9b33312fa9217aec656a23e6930928fb7e0e7c07611f11d9ea13fe8a2bb00e
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10544 bytes
SHA-256: 3f36294952441927658ba9f1441e4e595c4ced68676386a2621e47652cc58a13
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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