Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ceaf0ba4ac0da6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 16:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fe114241e32b820faafa73b9ea35eb42 SHA-1: b9e2b3eb3f4013c315d6243ca549f9134c6dccc6 SHA-256: c6ceaf0ba4ac0da65b0bbb3f931a21ba8f4272fa41ab4b5c044f4173006708a3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate the PDF acts as a link farm, directing users to various PDF files hosted on compromised or disposable domains, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://01host.ru/userfiles/files/22776256878.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/nolivoxadiworixizibi.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/sefopepopoduzarebipejoxi.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/xidizoferebofone.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/57136946173.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/25243454980.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/79226291916.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614251260ef78---zeridiz.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/35008525995.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zubumamabepobiwufetiz.pdfIn PDF document text
    • https://olterus.info/contents/files/99449274007.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/zefagop.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131821f5f43e---zutitezewavawitugij.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/77052974346.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p5pe6ih97fhncpmu04go7sg5d4/kapikafa.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/kuruxiliwi.pdfIn PDF document text
    • https://wrd13.com/force/file/wirusadozaja.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/debitur.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/42859905840.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/1962944500.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49b90541e---18041885072.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/pebef.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/73734575996.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jikitudirogozimitov.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xeguginunenutojubifezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=caesar+3+apkPDF 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 10080 bytes
SHA-256: ce9425a49674d67131fbb6e10fa67e64df7df4e33d8eb68587961e1ab2a940ad
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 18912 bytes
SHA-256: ee2134bcc661daef98f52a40573f3380f03941bdf49d778948951f1cdbc4ec42
font_02_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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