Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cffc5d1afd51621…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 21:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c128e33ed1a315f0609bbe62cf93f2e6 SHA-1: b2caf1cfa1d93c2f91f5dff17fb9ac154ef3dad5 SHA-256: 0cffc5d1afd5162129f2cac12f28765275f0a7b005c1888471ed44d4dc44ba30
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=naruto+slugfest+android PDF link annotation
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/89369075600.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613593a66d128---lamujinoboxekodejebegubak.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/5204798971.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31420648504.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8eea03af---50283844706.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/92835908558.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/32063225013.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d9232f4b---91178837471.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/mukup.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/sizigakopokufufig.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135027bd352f---duwevesuluwemibabul.pdfIn PDF document text
    • http://infosierra.es/images/editor/dojimanamuvuvidagizapu.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/25770701409.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210912_182235.pdfIn PDF document text
    • https://phunhai.net/upload/files/vaxibedowon.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/putilu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/55852033123.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/9167136647.pdfIn PDF document text
    • http://373113.linker.tw/files/63716756885.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/vewutusifipozinitugawaf.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/wupofonotajuredelan.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/45117713822.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/83684896099.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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 10608 bytes
SHA-256: 4c7832ed61651986e2b8a84e8bbafca51b5c398c1649fe65a4e0c954b2323bfe
font_01_sfnt_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 15804 bytes
SHA-256: b96771e4561355187f78d59d8f81d796bcf24b6c8c25be75c8c9e8070207aa05
font_02_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1