Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7a23aad064ff85…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 06:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ae65ad0db4333689a995e8b8c824458 SHA-1: a892652310baa3cffd34e0e000e57e2376acedb2 SHA-256: 7a7a23aad064ff852d751f5e740e049f5c09f255361c83e9c6a6b5424bcf73d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=claridades+agropecuarias+pdf PDF link annotation
    • https://retake.dk/ckfinder/userfiles/files/buzufixum.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/tagubuka.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/2188397669.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/doduguvov.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61f35728d---30595466709.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161285dac7b4d6---resubad.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nulebobotekus.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d432c0919cc00f85bffa0b63a71aa76c/29465601117.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e0fcafd212fd1114aff3a53f1ed9071a/75784348156.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c296d8a6a---bofov.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/54ef6c5fed634c6d49c65ee8d2fecd4d/sutufetakogerefu.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/rezatomudejaje.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/nimibiwuvazilukuwizafus.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vapibisobike.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/83509318922.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce3834f86---93864618558.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/lelulafajedimurobore.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kebinefufufaxog.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/zogimamujusaromuzeniz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120d7349ed2f---96252857189.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/83982628494.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_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 10724 bytes
SHA-256: 72ba46f0e6b2efd73f8fe3e99258a8661719ef752f6b5c406962d9e986ef26fa
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 18388 bytes
SHA-256: 3ec4090d61f24837c85766db9625aa49d95b17db0049b4f72745137ae6f48493
font_02_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1