Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e80b3ce2bf5616…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 08:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: edd2a3ee1ea1b13705a87a125671bad1 SHA-1: 07e1901c5883f9cb38d095a4feee55d01aaf33e5 SHA-256: a2e80b3ce2bf561696355cb8aca47b765e564d788ba1091b725f061b26242969
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/52c8eed52186b485ae8794033e76847f/16377122839.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0b27e732fd23f30a6834954da39add85/rixosevirafexuworopade.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/34957333011.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jujerevoradojijuzefa.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/85993991008.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109122123219899.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109080505563938.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/5691225844.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b237e123b6---madavetovinoxiruvu.pdfIn PDF document text
    • https://ip-pharma.net/data/files/liwilumefonagasotavatadeb.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefe367e8a---25331709490.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/93769153168.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/laloravewowirijamoti.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210910212309739436cnue3v.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labobi.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/noduw.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/tesek.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/88213323627.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/rugufo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/21530728025.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/7374481023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=draw+and+label+the+parts+of+human+digestive+systemPDF 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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 11452 bytes
SHA-256: c462e55347df85a22f2d012a848300351af255f6ca969324c18e7fb7d89970d6
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 17768 bytes
SHA-256: 904648ee308e02cc9db9fcc86eef9e2b076bded5ea93517e01a70b5fd0777a9f
font_02_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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