Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0da84248387b964…

MALICIOUS

PDF

92.9 KB Created: 2021-09-19 15:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d61db382f9cf0bd19b89fe268a71fa9f SHA-1: 9e07e55b9bb0e55ade10cabf59dcde065e6b9bf0 SHA-256: c0da84248387b96497f113119645b4147b3e4f77c7e793703aea62794c4c1561
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8d5bf577b84426a83f32a177e10d8221/wevawapip.pdf In PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/67088209799.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razonuzojorowom.pdfIn PDF document text
    • http://toroisg.com/public/images/files/serewe.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/xedatuporosivexomogoj.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/18103372292.pdfIn PDF document text
    • https://rinducm1.com/contents/files/30960979005.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/boriban.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d7c40370---fakojira.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/puxodopanasevowafuno.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/zisazefabuzoti.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd2b2211e---31631537963.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e49f5119d---mazofoju.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nelubelutubeda.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/51505313770.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/50267138868.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kizovujafi.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/jizegor.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/godonu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/58840954426.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/lobakotifuzabijalamegetu.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pameja.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/76860478535.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/35804856879.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/lutidizerewusesikokeridu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=harry+potter+book+1+pdfPDF 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_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 19448 bytes
SHA-256: ceb8efce11bf65f66c6a451c32ba1e284f99b15bfc83b767e1b3119fa6d7e733
font_01_sfnt_off00013656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6D 10468 bytes
SHA-256: 8a92461fbb11304179bf230227ccfb4f96aec2b604184abe5a3f76a366f74446