Malicious PDF — malware analysis report

Static analysis result for SHA-256 0faa451ed3d9f4d9…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 10:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b21913cae0bb89ab35c90204e1ed9dbc SHA-1: 1c44a58ae6b56629ed52fa3d69a8df9b2b9ee6e8 SHA-256: 0faa451ed3d9f4d99a9febdb8ba985188c14ceae8dae04f34bf2202113b70988
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 critical and high severity heuristics firing. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=how+many+eyes+does+a+house+spider+have PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614938558774d---22328955607.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/17106867993.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bekajevojegasefopuxon.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/83706650884.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/93967357032.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/54786239241.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/tedefivagokitifaj.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/65329206663.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7c7015c2---werefejusadalosevonuji.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/kowiwapupoxojavonukidulo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/58241567245f33891f503e927f00a3d0/zadabiwakidote.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/piwijilejer.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/60809029897.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ziminimavim.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/vajawavifanorixokuwum.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/86382180152.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16157f7f635b21---26407112632.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/55042783883.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/zibep.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903044309.pdfIn PDF document text
    • http://tlznailspa.com/media/files/83206112752.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/88268574028.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/28586624022.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/fasek.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_off0000affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 15336 bytes
SHA-256: 6730b02f13895d2a8b6dfad7243b5de537a13602370415affe97bea87ab151fc
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10872 bytes
SHA-256: 730b0506640fac0523c41462b7f595650634bbc456d4fffc1ab1a58e3fc3e677