Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26b335f67e28d03…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 01:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 637fab1eea123299580938e9c0170c0f SHA-1: 78242903b0fe6fe92fd2d89bf1fe6143bd4ec7a7 SHA-256: e26b335f67e28d032cdfcbf9298d5a671f94f09e9a88b098b9e5fdf5f2543f32
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, forming a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://learnersdigest.org/userfiles/file/pabumopokujetipajawolu.pdf In PDF document text
    • http://st-johnson.com/Uploadfiles/files/rugonofago.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614772e5b16c0---27105859361.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/bazodusidepulizaduxi.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632015897.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/91768474233.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130939483020---87411205956.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f4582c07016c1426cc560be6adf130fb/dukudizukulubopafiviluxu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/38667622962.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/40040743017.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/temumovenobimawenetupe.pdfIn PDF document text
    • https://best-label.com/upload/files/56951116735.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5d9500d8df12ea93a8c17e8e13e23af6/vatazoxas.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/64572731387.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613d628cd1421---30791155319.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/67127512852.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614571108f45e---razexuf.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/32847838366.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/95104525346.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/23495548805.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xitagawebugulowoxepefe.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/labowogogibepugomeputeler.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144c98dbd28c---5337703913.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/luziseguguxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=iphone+11+128gb+price+in+bangladeshPDF 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 11168 bytes
SHA-256: 607ae280554b8cc14d18ef502b73bd18628e15b2a9c4dac46e978b8e791b42c7
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 19604 bytes
SHA-256: 123a55b37c267e1cccbb6cde92360c910830bda2aac0143f5bfc454a37b26b91
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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