Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b36fde67fd5e5e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 17:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2707e572d39fdc954e57a8a1fa314a7d SHA-1: 032074e8f2bc83c2c731e9b9237c203ba818195d SHA-256: 07b36fde67fd5e5e43f16fec02d0382d986b50b762458ed72ff71aa8822850d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading further payloads or redirecting users to phishing sites. The numerous external links, many using 'utm_term' parameters, indicate a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=linking+verbs+worksheet+grade+8 PDF link annotation
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45645118811.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/sutowixuwafan.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/7164375843.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/jerorasip.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/fesamafuwexosirolazo.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/91321900260.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/18861787205.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/19206807604.pdfIn PDF document text
    • http://landpas.pl/upload/file/gizavitonabuliduselu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161358cc768672---gunilamozubadejunuvodana.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/84753824297.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/gemiwekevip.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/povukutexopoxod.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/64279771481.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613709e99e65f---7007291926.pdfIn PDF document text
    • http://premo.at/userfiles/file/fupujuwasokisimeduxuxanib.pdfIn PDF document text
    • https://expomediainc.com/upload/file/6542866915.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/pafigajudodudajunexilenaj.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/94085402887.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/bexubawurejotaluf.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/82242047863.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ta8kduegetufkl13cig491j401/81774525953.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/jokemunobawobabix.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/87429989679.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 17592 bytes
SHA-256: 770a16ce6458c26849bcf22249e327180ca0a2e64eab0a7bcd15fd281793db58
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 11028 bytes
SHA-256: 86f0c760b6c04c2e8e7ccbb00efe26eb443f45a4a153aa205c12eae6bbc18152