Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40f9437f0dc551e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 07:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 132cf0729dc5a79ca246e7ce46b360a7 SHA-1: e800c54e4b1aab86ea41475f10395ce4927a12ee SHA-256: c40f9437f0dc551e6652e9882adbba581cddaec8fb89098482215063f1a7e89a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and link farm characteristics are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=in+conclusion+to PDF link annotation
    • http://wsp.pl/userfiles/file/82386967906.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50299775061.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/15002647924.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4652ac1a6---jixowamupuxeboxujemil.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5ob9r4bfbf81m2jvrqc39chmoq/75378319686.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/3039641578.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/91e93a47d22eb8eae9c0feca1a98d861/nodusowidupowekajosipor.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/nofinumomelamozamem.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2bcc7a08ff---limevojowakilorukevukoza.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/2694810517.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf2b755b02---pofajuzip.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160843e7f3b148---ximawasekutuwasud.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9eb01790c5757c7bad56e86a2ef9e665/76521043276.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/31911764909.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/10a1dd348976c78ee68f51a9bf0a03cc/30781947246.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/63014871764.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/86cc93fe2ed48b5b19b89fcf70652c16/44067476554.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/zelapisixeratat.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/dilenoji.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/p0sctrini0rcipci0lngik8fl0/xonedumifosifanofore.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/26970972709.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112bd730f9a0---nafubavemino.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wikimevukukov.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/77370261621.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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 17688 bytes
SHA-256: 6f8176b10fb6d26944e65f90753c824c0109e0e37702840918e82ccc5fcc3b0d
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 9880 bytes
SHA-256: 8af2f530ec5d7a5f93a714c06a307a9094fd02ddc5a32a697b96f7dbabcbe5a4
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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