Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6cd84bfde40138…

MALICIOUS

PDF

91.7 KB Created: 2021-09-08 08:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84f9ad75d47330f24939d71c099d76b2 SHA-1: f1b2cd57f89fa15bc69da180d7914f5e282339a5 SHA-256: bb6cd84bfde401382b7a6f02d1db925ba8f0e5c9a2b3c71ce03bb03d48739344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://alpha-th.com/userfiles/file/bezivutivabodin.pdf In PDF document text
    • https://masukpt1.com/contents/files/39182243364.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8ee584e4---ludixesibadokojigud.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8b840a02---16624589261.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f98e09f049c---17576948066.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609679ebbb7f9---powowosebipuz.pdfIn PDF document text
    • http://iphysiology.ru/upload/tamubiku.pdfIn PDF document text
    • http://clarasonic.com/upload/file/zimiruge.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sawotirekitoma.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/24992259930.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0m41a9ikp19unvci8vaabtth7q/44417292098.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/62476936008.pdfIn PDF document text
    • https://kopari.hu/files/file/37799601757.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/49201808256.pdfIn PDF document text
    • http://unsersohn.ch/images/file/68910527791.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/joxuvaxi.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/tfdj8jhbv3qabou63v0eiqne91/sakafivunikejaj.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/95205638206.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210722133255.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/72165386719.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe65c15b9c---sokilijomagabi.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/41692482989.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/32595741760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=splunk+spl+tutorial+pdfPDF 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_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 18640 bytes
SHA-256: e3ac1b49a9e05d957badab31d360ef64b69b62f5145665e020761bac5f164397
font_01_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 10628 bytes
SHA-256: c5817c683c9cae9f0d3296fccb9c6da08441dffe764c373ddee2e642f7e43417
font_02_sfnt_off00014904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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