Malicious PDF — malware analysis report

Static analysis result for SHA-256 91796206b5580f4c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 05:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37a297e1c3824147a4c8fd337dab12dd SHA-1: 3461b2832c06a77c370f081fd5a2c01ae9a2c798 SHA-256: 91796206b5580f4c88f417aa71655f9618dc545ef474d7c6ed5905733d3b7022
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to link farms hosted on disposable or potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content or downloads. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://balaton.varosom.hu/userfiles/files/kakoza.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/70199267497.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/85240936312.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/30466860838.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/dabedibuseba.pdfIn PDF document text
    • http://toroisg.com/public/images/files/didepatebifipare.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/65806308826.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/bebodogobam.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vivetifonapekujunasak.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/nufileforujanetew.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/xaxewifam.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/funototawobuvosofamaj.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/36151151571.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/31003255984.pdfIn PDF document text
    • https://pellevah.com/upload/files/sowawibagotaxisifivixedeb.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/22916616661.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kuwowizukizuser.pdfIn PDF document text
    • https://invision.buzyhub.com/files/jitefisewamavifunevano.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/turadarovegi.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/kodoniker.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sawutewi.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/loladu.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/pabarajubabuk.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de0bbecbe---27505004187.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e0b514702c9a1a885cccc818d564fbb9/65388742938.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabe283d00---76860799770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=deadpool+classic+vol+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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 10428 bytes
SHA-256: 4c79a8024b13fb13d7ac531d649b8d3f0f1d6fd4711f20d2ad1f3e146aac1d0d
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 18100 bytes
SHA-256: 4c8a7eda497424bd5590945adee10f4fe84ee463e9b8b6e3c7c3fbc03dd481f1
font_02_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1