Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5157b3bc5eb628…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 14:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06d89a26b726a99f9354d491ee6812d9 SHA-1: 60527f92cd196c968e5c03686d2c77251d88be50 SHA-256: 6c5157b3bc5eb6286e725d61ff121c56765f79db9aec89825f0549a37284dbdb
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=command+and+conquer+rivals+apk PDF link annotation
    • http://rem-proekt.com/f/file/faxokimebuzimibusugiw.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/17681500152.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/popajogudajadeboluko.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jikepusonixalofuselonigo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/j4uj738n1036fb6u69nhc9b883/dotufogosixemateko.pdfIn PDF document text
    • https://binhvi.com/upload/files/70197570015.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/baforifiwekezavigadujewu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/17196656809.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/22440572881.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/79872243722.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109082050592641.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/guzeduzunipevinaxevat.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4db3ff17a8ef7df77325c74c8ad78d78/guzinokuriwimitogatodumu.pdfIn PDF document text
    • http://prograsifkalip.com/files/83926249852.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/95289584435.pdfIn PDF document text
    • http://emeat.ru/var/files/godemukifutevamumav.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/99121694797.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/94519942566.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/peneme.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/napikoparegepi.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/26454083384.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/morozo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/poranaxigupunigitapux.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/36632c31b9b5f74dd970b00d72b7ebb9/3733758827.pdfIn PDF document text
    • 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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 11012 bytes
SHA-256: eb215796b956e8e0bfc25b6f57ca3497042c2a0d8b6e2d5beb7d8667a21bff76
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 17936 bytes
SHA-256: 5c21fbba71daedb65bcda3dac6f8fab1939c95fc8735d0b07176aaab1bf1ea4e