Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9452fb9f76c5d6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 20:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02215b170d84db628207d6100f04345e SHA-1: 443f85f57f974816ebc7ebdb21b28e8a8356a77a SHA-256: 3f9452fb9f76c5d656e6e4f18fdaee7224b39d2f43682650a1e1ee5901723446
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=modern+war+mod+apk PDF link annotation
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/zuderuvesesidipab.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/125ff0b344530ed8f1185643c87d4b74/ludazejoxu.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/98778126770.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/928149192.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/24016315716.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/8875737820.pdfIn PDF document text
    • http://turnyras.lt/Files/file/revabitef.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210916/1826041303.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/82869312831.pdfIn PDF document text
    • http://vladekoservis.ru/files/fasoragapebum.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2041d3e43---nolirirolowefutinozu.pdfIn PDF document text
    • http://badgerhillfarm.uk/75347532583.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5e6dc1cb---venavujizibaxutefinodiso.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///51864852048.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091644732_279599530.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/omowabuzunokuvuzopanonaw.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/lifekefuruvobim.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/widokagokizux.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/85508093303.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/lubisova.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sedenarukatexagokesewotu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/milobutobemaweganu.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/vejelesejug.pdfIn PDF document text
    • http://jinyezi.cn/upload/51405059940.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e8264ffe---32969215737.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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 15804 bytes
SHA-256: 288eec714796b08a6016d4472c5fd80e92c5a2c67a8353f0c817bdd9b09496d5
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 10320 bytes
SHA-256: 77cced6bd3734ef180631c0a26c10d9f570db28c4258321c8db9796c054a4127
font_02_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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