Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a906a941c506224…

MALICIOUS

PDF

71.4 KB Created: 2021-08-29 12:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a435ace18780796958d6440c9b3d7ac SHA-1: b4e067d66863f7a20947d5e5b40ceff887bc87d5 SHA-256: 6a906a941c506224ebd8bf04c5aa50e11afdb6c5ce0e09ff34689c59045dfaaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded JavaScript indicates a likely intent to download and execute a second-stage payload.

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://nguoixunghekiev.vn/userfiles/file/pirijotazibeged.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb3c04275---41864486268.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/visefodadulesupol.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0fe0da4ce04377c6e903686b224420bd/83578161469.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/sovaza.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/nuraxipamopetabusurokud.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zimonuxewapoxugexov.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/32493766592.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/vapinesiwen.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/82145228167.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/46870540175.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/pebuzojedujopituwedanumuv.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8812cd81---jesitebaf.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/96797517733.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211642e291---pukakelidipon.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63be09e57---vodugugajukas.pdfIn PDF document text
    • http://waypl.pl/upload/File/95850325797.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/wunosutib.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/zotexulamo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k69reoo32piooa9qb1d0gsk7t7/nedekasapimudod.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/votivujogidapagodapuresov.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/89310905115.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/ledogolezozewijan.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/futuvubogugirine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=incredible+hulk+hennessyPDF link annotation
    • 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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 15492 bytes
SHA-256: 1d0692e4a18a9de5059fe0bf813b8771a60858542f57b7727c2195b807e1d273
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10484 bytes
SHA-256: 8499d546ba6df8063a409341aa2e27739dc09783f45232f01fcb83ce8d449e71
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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