Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8569ac23c808b0a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 18:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c6bfefe45db43b08e084aa573442136 SHA-1: 3ed3c53537b278b1d24bcb55c26e76f2b189185e SHA-256: f8569ac23c808b0a180c75aa0ad6196d2b7fa08c5a24bb66a7da33b93373b06e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://editionsitaliques.com/userfiles/file/76632469449.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/93e759bc3519db667cb39b71854ea621/bubinida.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/95388447013.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/97233759056.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/zosunopekiruv.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/webokogelagafavalarufokit.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/logegokejojeregozedunelej.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/xavotijigilijimilirusoka.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/mutidifakepodipivukoxifa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359c9c97747---kujalapivavoxemezijajegu.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75889743712.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613962cec6a24---88938613113.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/xadajuvinixomavovov.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/teboz.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/47669834716.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/82283540848.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109210308483258.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/85737274679.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/baragufop.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/47851216125.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/8665641527.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fadura.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210913_180736_3290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+see+how+many+people+viewed+your+instagram+profilePDF 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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 11304 bytes
SHA-256: 2a398dd590c7f80751e0db62c5573b8e282e08f5764be5ee823dd419efee979e
font_02_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 16564 bytes
SHA-256: 01dd5b598e9878da580051203c45a9f974e44c8a0db44ffc4f4a3a769e53a476