Malicious PDF — malware analysis report

Static analysis result for SHA-256 2deab79630e4c1da…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 02:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31d42fd96b66cbf6717b5b3c76832e7b SHA-1: 1b5435b887435464efcb2672cce63103ee295d43 SHA-256: 2deab79630e4c1da0c1246728e44c54e84eec2c5edf940c351457d86f0f8f5b0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://enjoybowlramenandpoke.com/uploads/files/bikalevamunopor.pdf In PDF document text
    • http://mprime.net/ckfinder/userfiles/files/37965005927.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432855399f---74753588932.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/62826608462.pdfIn PDF document text
    • https://lasanisports.com/files/gematugorasalivo.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/lovijexexasiduzisifobidu.pdfIn PDF document text
    • https://yodobashi-church.com/jidofanisazumozokazi.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/zowuboxo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kupap.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89554272833.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161440fd4047e1---76233056413.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/japitijofuzebujot.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/68512812382.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ad946d3088e8df0939c0ea4d0ff19efb/zakoxopiwifusivukuzo.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/19044265816.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/15236640724.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duwerazetisodi.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/76778412100.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/papumovidarosiwu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48008546576.pdfIn PDF document text
    • http://videocycling.info/files/file/bazogun.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/66912228757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=word+collect+game+downloadPDF 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_off0000b0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 10532 bytes
SHA-256: 8022bf573c59383e971ff901671c1af8706bf4934d4eb39c47f40c4b38c22ed7
font_01_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 15316 bytes
SHA-256: 2a0d1baba1d534a6f10d3cc8d46e1f333723d97b8034f3beed1bf48e722e3ebd
font_02_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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