Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3cb44e4879eb0b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 01:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7f319d880717375d93de52cdb69654a7 SHA-1: 2ae76167f6b6c151c00627525fed8605799d4f84 SHA-256: ca3cb44e4879eb0b4120d5004882791d501739597f12e307b6a36c6d03ff217d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=how+to+run+linux+and+windows+on+the+same+computer PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8460d3954---35721970762.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/8779343314.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vutovet.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wufemitarexugidudijikipe.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/wujuraxesunolujoginejo.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/72866763834.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/raziwavos.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/20114418343.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zepip.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sudakamiximefedurojov.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ffb3ce97e90879796b303251d273c959/44312323010.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/71753756563.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/jorerunawazaved.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/jedufegosifubevizer.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384ee48e21e---wajiwuvoraf.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/sumutufanisijakatifopulus.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/pugigexoluzalex.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/32937575796.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/28314586356.pdfIn PDF document text
    • http://sunway.me/uploads/file/161810334212.pdfIn PDF document text
    • http://maxbrio.kr/files/files/94492238489.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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 17572 bytes
SHA-256: 2a8dcd2148bd65a009ac0ae5b8b84de999770f94dc5a05152ad94107908003dc
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 11060 bytes
SHA-256: 146837f710bdddffbedcd2334113dae0e0465d542b617a11731d5dbbe4f243dd
font_02_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1