Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fe4bea1d1d0f6e…

MALICIOUS

PDF

96.2 KB Created: 2021-06-30 11:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ccbae04006dbea347a2fa3517a45ad88 SHA-1: ae7f5b3d812cb94b87bcb8e0cf96b0206533a6ea SHA-256: 71fe4bea1d1d0f6e818ca0292c538a9bae2967a8a63683de9c6efa2a79b2e5d2
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on compromised CMS upload directories and disposable domains, designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://bisnismedsos.com/userfiles/file/xanowo.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c0538588---47991367385.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfe5b7cf7---84338036093.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/90eaab0afc5132f7df78dc15fa5b9206/befeluboriwomajo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/28859551009.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/892024970.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/46938884979.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/df97168bba7df5182191bc219146d8f4/30644776897.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a6275de7e16d7b6aff89da67b3ef9ded/dewafofuzujanodokud.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a920cfe229d---fobulawozozikumemef.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/wopazomijetigoxu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/kugisepidobotigekozaz.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b0b8bab403ac4193365f875dbc7210b1/54133954486.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/tabosaxopisilaxoza.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f99d24ab03---pusuzefarawalopanazi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wasafazute.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a483f861898---gorixibololin.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffbf977fd---57465917548.pdfIn PDF document text
    • http://e-district.org/userfiles/file/tabiwatobazutufiwakita.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/gaxuzavagiwelusatugezog.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d71d71c44---97402110261.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e1d563521519012d86681411377fb03/9546444943.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/tatijewibutalofa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4b4b4cd6---kigawida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=subscription+customer+lifetime+valuePDF 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_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 17344 bytes
SHA-256: 7b39ace32345d3dd9eabc06fc0dadf65da7026a79824bc3c6762dcf2dc4f080e
font_02_sfnt_off000159dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DC 11020 bytes
SHA-256: 9f6811239a49f60b32ac2b32f6f2c803ab28e4d6858be4de77737ee04483ef45

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