Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b43f0415e2e9fdd…

MALICIOUS

PDF

64.0 KB Created: 2021-08-16 04:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: d83df1a6b776b26e37d5c3f49b0c6cfa SHA-1: bd7d6306633509dbd12820027ee8304ac86e270b SHA-256: 1b43f0415e2e9fdd0e690f5954c158ef4e3b16384c10a7e2780bad24a1223e48
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pistant.ru/uplcv?utm_term=palme+biyoloji+b+konu+anlat%C4%B1ml%C4%B1+pdf+indir PDF link annotation
    • https://realxenon.ru/uploads/files/66900166295.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tmm5cok9q5co75ks3cgdr6ml1c/dirozo.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/rasibovejaboforelowakaxak.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/540114370.pdfIn PDF document text
    • https://digireg.it/upload/5643583742.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/libinasawi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/72732145927.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/98304005029.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/nugajofexuva.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160caff9d4662b---67525960542.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/naramaresotigakodigure.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0da5adbe---93832925221.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6479c6f5ed---2604177021.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/51395800356.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6b9394f1---robazokutolerirataja.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1b86c3dab757efe3165fa65cd26eb4f3/nolabemizeta.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102e080be11c---raxuzexifofubix.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/gepukureja.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/68298300512.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/olth6qv2blt431vu57gpc5fqh5/59234987421.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/sifigiwilenek.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 11112 bytes
SHA-256: 7e415cb9f61b83bc69a4ca55ed5141f8585f61cc0fa4479f5238711ea65566f6
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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