Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9c5a53dd330f44…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea5488fb666c91f296fe8aa43c1b3815 SHA-1: 620112fb0cc7acede6b159a4abb31b8ba440242d SHA-256: 6a9c5a53dd330f4466e6b7e335a2a4afdda275e39742fbcc49c87648d5dd1b74
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/88514026033.pdf In PDF document text
    • http://2safe4u.cz/UserFiles/File/luvutoritisamalidixa.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wejax.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/5827965075.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/resazuterazopevuw.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/35842709340.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/xawibejodojaledanenabo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032e8e2161---88901049990.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/pizaviben.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/xenaxi.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/bodewiworijakerixokel.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/89790227496.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/dakujivovosodipun.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/8251243271.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/betuwu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/wuwasaridigumatesasate.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210903015343.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/joxejotijevijofidifuwab.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381a9dafeb7---vifibusanerusozaro.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/77350993194.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/66761387557.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3cmkk63b198b54hmrv7a4nis63/xidisaniketujeralum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acres+of+diamond+pdf+downloadPDF 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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 16100 bytes
SHA-256: 556e2cd05bdaaec2c4e3513b2d6fa40e0a91b0c15df29f687254d407ee129284
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 10748 bytes
SHA-256: 09dd9c2f26da655d5f57ce6d2968de199a5881cdd9b6cc3853e4923b3555bf1a
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1