Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebbde7b05475a17…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 11:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3d64d35c3a88d8478241bdd70bc8f97 SHA-1: 47136974352e34468186b3150bf47f10a1644184 SHA-256: 2ebbde7b05475a17fdbe1b8c3454ee6d4f54f4f6915d68c7f83f5d3695c09f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. These URLs are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=abox+soundbar+user+manual PDF link annotation
    • http://amdind.com/userfiles/file/kawobov.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bc2bf5b51af9fd588f3de9399cafe622/73934179838.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/jifiruvedolaveji.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/39528754578.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/40798724960.pdfIn PDF document text
    • http://besteva.com/upload/files/lajito.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609986a841e28---rimalozizuxujesiligo.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jarirolisi.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/zufigijirivugubox.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796e287635---ruzazufovosagep.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/70280120987.pdfIn PDF document text
    • http://jarosi.hu/files/file/34195291025.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/80c28d577596dca90fcbda7e2b483245/47691396966.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/bedadi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160924e4f0edd0---59597280350.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/52377297815.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ia2b2rbcq46jiqt269rg54ndn7/32118049158.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/purisolitegusu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/93f881ea0046d5f592e64f185f2ae7f6/lerivefukawaraw.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/nesubapuwoxozexenovugore.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/lisugotexajupuxokis.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/47697224846.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b32d526---nuvazuxoduxukedasamexe.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_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 18268 bytes
SHA-256: 9e6a6fa9dc722d8e042a7271bd2675473ec34e96d3e96ded65ef6eb7c8835db0
font_02_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 10540 bytes
SHA-256: 1c3286a9d19551f0606cb704610ec6e463e76f95238be40ef5751c958ae4759d

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