Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db00c93a73f64a3…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 16:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36826e54f7ab0f3a635dff1168272d2c SHA-1: f4826901a0afebbdc3a1bb7121e3b2c328237a86 SHA-256: 1db00c93a73f64a30af8757ec2a6293be8e1f3cfe0447cb8ca9df1597fcb19be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jainfarms.com/uploads/fogepisi.pdf In PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/desogujumimab.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9952c928d82b272cfc360f1070878705/40777640670.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/20616292941.pdfIn PDF document text
    • https://dalba.net/other_files/File/345394747.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/falujorokabuferagixo.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/fiwakuwosezodekigiwewef.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/86950904205.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/92274362647.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vuvijupilemelinodutazoku.pdfIn PDF document text
    • http://355353.ru/userfiles/file/41311281393.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/51890857668.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/48882509531.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/49258252231.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zinej.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131472552e49---85952512679.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/30217462232.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a7549a4c---wibonosirakodexesolikor.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/bowogobilijomurumojaxa.pdfIn PDF document text
    • https://denimder.org/resimler/files/wavozimunef.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/90750026630.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914042959354119.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/kabodilezexap.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/64333735829.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a4de4e51b329ce72c84f9f3cc8c81970/69661557402.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/89649594489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=keystrokes+mcpe+downloadPDF 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_off0000b949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 16736 bytes
SHA-256: 6445bdbcf04515f7bceee9930830d6bccdc75e5a65925466d39e531a31d6c1ff
font_02_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 10868 bytes
SHA-256: 3a2273df6cc198cae01044035896eaddc53c3e7325a9264958a2dc4138e14b21

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