Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7dddbda011668c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 21:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f7db56fd2e7f0163f9cd0ec024fff81e SHA-1: 31c95fd9afc32a334e29a58637542e652ed28137 SHA-256: 0e7dddbda011668cdf85fbac909cbebd4f64c4c696ac0774a2854de9d2c094ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the use of compromised WordPress sites and disposable hosting for hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=app+voz+a+texto+whatsapp PDF link annotation
    • http://ingegnasrl.com/userfiles/files/beturudegasakuset.pdfIn PDF document text
    • http://lejuriste.ru/files/file/minixovupefubowageb.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/46151462154.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd31c6b4cf---85949076743.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/81765214024.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/foworixiwis.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b61855fdb---buvafukewedipenupobebotug.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/butotasedetisawowegipuwal.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97694352779.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb646a2ac3cdede514fa8700faee3325/90854063299.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/61024783050.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/wujoluma.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dibojavoj.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631073714.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146242cd404c---15022878187.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69036722853.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/taxamakuvijurujutikab.pdfIn PDF document text
    • https://nevisnews.com/userfiles/lebadizijam.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/66250880751.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48880b23a---dufimogalunikajimonamuben.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9459ce8a1---dimubegixamalipoz.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/vubelesugaxemewopejenili.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc47082ef508561ee53850c92246ea84/tabazuwuvusebafufew.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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 10304 bytes
SHA-256: 0026de8ddd34cbb03970be75586e9ad1c0463ee204a2125e0c8a67b2987100b9
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 17708 bytes
SHA-256: 00d8618ac0053a46c1594b2aaa6a319ada5773622e1f10832665896f888abf0f
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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