Malicious PDF — malware analysis report

Static analysis result for SHA-256 727e2251cc310677…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 08:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 106e00533d21903d9bcd2b97a4855235 SHA-1: 8a726fa4fd53bc422e3a856fb545fdc9ddd5fc18 SHA-256: 727e2251cc310677a103fb068e4ca4a96be8fa4f0d8cf0e112ae43e8d788e5db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=fusionner+deux+pdf+sous+mac PDF link annotation
    • http://3e-machinery.ru/app/webroot/filesfiles/dosuri.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/22914436273.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/pimajetijosivuk.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/624cad27bf0afa1f0f873e91e072c932/valasija.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161289277cec7f---17789500132.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607487fbc009c---83383408360.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/60202566938.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210521/210521221640355983ysgk8ogf3j4k.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/85368945756.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/faxabalapesafiwapasap.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jixemirutisunasosa.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/62363296048.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/razenezarexizelilenaxek.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cbba2ebf---61313683126.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab38080531---mitubewebozosuvegenamil.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1b2a299853306eb236b46c926e53e84a/wefilexiwipesa.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/vepuremituxexutafizexijux.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/89317436277.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/10074388662.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fea12c7bb32ead4e25ef3ebcb25b01db/zemifurimuriwogivon.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/vijiw.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/25352847575.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/67215997082.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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 19676 bytes
SHA-256: 3e60e86b3333ea40f64659dac8c4d2447d3b89af024e17e8f037c7a0f18afa79
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 10816 bytes
SHA-256: 5e5022fbd184ea3ea64c6496881e0eba825708ac8c0bc6ee57a9b3c4d366d771

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