Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddba8b3be6677ede…

MALICIOUS

PDF

95.1 KB Created: 2021-08-12 12:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 680fdf16e37b812f5eef7c3f6ddc23bf SHA-1: b84d4194e079e08fd4e730895810b829c208fecc SHA-256: ddba8b3be6677ede275b0183238949a12f4078343bf70f5d2318f36952fbc88a
192 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=pronombres+demostrativos+en+ingles+ejercicios+pdf PDF link annotation
    • https://clove7.com/userfiles/file/46206535719.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/91375960086.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/xigizadumezajuwigi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/bkm5jhnnjt36iqhbeotqu44pj0/82423223839.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/80978203156.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1615663bee---17511537558.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dixurekobe.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/mozax.pdfIn PDF document text
    • http://blueyee.com/upload/file/040819097403.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aca479ea3---bukibogotosenup.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/ganedeweluw.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a320793414---54713304340.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/69196564271.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/difawefunedadelam.pdfIn PDF document text
    • http://garderoba.sk/images/_file/36092495838.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/36519515308.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/89201597654.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/87708349176.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/kg4vcjl6sser453qj5hgvh97r0/sezimovimizedaloduxuz.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/xitemibabonilopo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e17aaf49d---11798118086.pdfIn PDF document text
    • http://77.158.216.156/ckfinder/userfiles//files/28782288568.pdfPDF link annotation
    • https://optimustelecoms.com/ckfinder/userfiles/files/paluvudakevafanebibon.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/43158964857.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/smofe1qhf4sov52dvil9fuds9f/zowurezofubumi.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_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 19560 bytes
SHA-256: 91c26b9cd58998dd499c245a3a4fc04ed8ccaad8be8a0e11e5d2283ea6380cf4
font_01_sfnt_off000139fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FD 11300 bytes
SHA-256: 0fc518b791a1c4d96ef9a3f980a89ccc62d55d6950f93f30711a649f262a96b6
font_02_sfnt_off00015419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1