Malicious PDF — malware analysis report

Static analysis result for SHA-256 d226e9150f09b80c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 00:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f0765bcd4a2296af69c8f30b450c493 SHA-1: 34426c6c6355d52efd1a463a6b7b86e832f9bb89 SHA-256: d226e9150f09b80cff34593251bfe66e2caa6b3cbdab4b7ace7e5b5fed0d63d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress upload storage and disposable hosting. The presence of embedded JavaScript, combined with the link farm, suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=snaptube+apk+download+new+version+2021 PDF link annotation
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xuruvoje.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a93c77f795273fa01082bf8666831bb9/51432749791.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/86075749338.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/13dd33b4e1643b40e0917d35852a9194/kuxujeginipaz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kufebagupo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/50135864984.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/70073696652.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/gegiwitelamunikonakekezun.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/gujilixiputajesowuva.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/94920026726.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/38977191783.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021982328152903.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52742781892.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/18080069274.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210909_654C3809CEEAAB2B.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/11625402695.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab80427---6491982546.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/94569366270.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vivasejubugugitaxebakotug.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/7915979992.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fuzenexob.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 22228 bytes
SHA-256: b4bc6f5775dbebd2a7ba035f1615ae4f36ee3e6391f68ac4a6988c0f20ccb089
font_01_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 11240 bytes
SHA-256: 637b9c1c279c8b5d8af8a97a33d6d830ea6305500d802647edc7aaf0cee81ee2

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