Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b91b43fe3edc108…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 09:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c328eb85ae5791e7def8b2f34c3f97a SHA-1: 3f95792d857339ddcf48ee826adb8c68a817545b SHA-256: 6b91b43fe3edc1089931af7a814f96d484a8ba81be1c4a2ff0cdbd81d2557508
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=ielts+general+book+14+free+download PDF link annotation
    • https://kingdomdatesuae.com/userfiles/files/razukudurenu.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/tekanaxez.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/fesofuw.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/funosatipoj.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/fasamubasixuwe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6a3862140caedfc0b8e2ada9523f28a5/pirobojozewi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/53874324964.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/vijesedidazigop.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/limolinibe.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xusisimisoti.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/85og6su6t9tu2tl6aldjvc1fdn/56829932390.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nowuj.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/93600213868.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/vometijoguninud.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/50367879562.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/13709630557.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4ad211786c011338ae99710999a37334/86317002413.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/3590771148.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/14729948539.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/fewakufu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/letixutibejejotaka.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sefos.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/kirefuronezixokek.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/rovebezejalaxewodafiluj.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/45991736798.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/tukepatotonugi.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_off0000c4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 17388 bytes
SHA-256: c4e1257272ee9ffb4cf70ffe1dd5640a4e49a64a64302567a19b3b6a599d275a
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 10836 bytes
SHA-256: c140a5b01eedc796ac59141970c78956f8f3f04d98d8cbbbe1e6d9b2acd6efda

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