Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5342010b3967337…

MALICIOUS

PDF

86.1 KB Created: 2021-08-13 11:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: f6372cc53ae6419a2e677bff416ff452 SHA-1: be2fa2d6463a333e7e9abf5c5260158917f59334 SHA-256: c5342010b3967337772ea899f2fb9cdfac6951e3d3329dcc2643d438ec2a26e7
154 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6755

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=5e+monster+manual+expanded+2+pdf PDF link annotation
    • http://anapro.com/ckfinder/userfiles/files/91637936546.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608115d69c685---83073571926.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44346536787.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/62364619926.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/riwokidunamupazifasudumat.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2d9afc3a---peloritowajodagovokusade.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add45133e31---95661333438.pdfIn PDF document text
    • https://ismart99.net/upload/files/29486923054.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/wanujosojusuxetilijuri.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wopururejeritudepig.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/8115498103.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122af94eb8---38916199487.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ed15a085cf32bf775528f74f4972aa38/nubavetogajotifegele.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/14145267040.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/suzebivefakafoboforimo.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/lowederaxuvudilawiwufe.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6i78eao0hcjq0d01guod08pnci/wimidakivodopu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sobebevemiwefubivuvotum.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/jepidafeborevifiredug.pdfIn PDF document text
    • https://badoza.net/userfiles/file/fuxizozazuxaba.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn 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_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 10928 bytes
SHA-256: 89d205c69b03791c4e94ac006d2e3d8ad780d378d70c04e43ef465df635192c8
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 18968 bytes
SHA-256: 223704e554b473fa638bfad84348f2000a8fd8c0f1e00d0aa782ca5f3a29c5ec

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