Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb33085ffb8c1f19…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 22:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3501fbf989293666741be83090bdb455 SHA-1: 729859a5d070c17676ba23ad29e0ec808689e6a3 SHA-256: fb33085ffb8c1f1976ffe3d7300107150cdf2007e382198caa1f21e66e51416f
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 disposable hosting or compromised websites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, highlighting the use of SEO techniques and compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ekbdrive.ru/ckfinder/userfiles/files/71485603714.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/winiduwag.pdfIn PDF document text
    • https://guijek.com/userfiles/file/28141772270.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralokibazafut.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339efc707fa---saxekola.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e1b4e6df6ef81e92f12696feb03b4756/78915170637.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdfIn PDF document text
    • https://vitanov.rs/files/sokowafunotokolegulijek.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/58832094534.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/14996385090.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/ruzabemor.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/nawutovil.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/107110636.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/12416918089.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/52419726887.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/052a586e8c65abae963b2603d5a7bf0a/lubowubuwud.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/27051695045.pdfIn PDF document text
    • http://elpijisystem.com/file/48145239574.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/92654487776.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/88372246754.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0a4d53175f28e4fa1dc808fb76855fce/97397905214.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/45502877762.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/56266550203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+app+calculator+codePDF 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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 17564 bytes
SHA-256: 8bac8f4076dbab91de0ad657f787faba5442e516d0e1bd5eb9d00dd35c488516
font_01_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 10420 bytes
SHA-256: fb08255e5726dcfa92bfee25b5d661d8402febb9e38286e466bf469256c3c0a5
font_02_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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