Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fa4c927f3d206e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 03:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 398274b440fe246ca004a38bfdfbfdcb SHA-1: a48bd6e99534d0afcb32683706a8aac8a72ee5d8 SHA-256: 68fa4c927f3d206ef7cf201e3ecf4951566f46f3ddbcc5d2a5060c2b23710dbd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes heuristics indicating a password-protected archive lure and links to compromised WordPress sites, suggesting an attempt to trick users into downloading a password-protected payload. The embedded JavaScript likely facilitates the download or execution of a second-stage malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8tq36qd2m11fcc22e38gp70kfv/21002770905.pdf In PDF document text
    • http://lnianemarzenie.pl/userfiles/file/82424225458.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/mabotegajaxulimatumira.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/8252363884.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/namefa.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/35799283856.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xusemesexe.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zujikulonovumelokagama.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/xagederedodisida.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/zezutexeju.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/32835057924.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26332972e---93788396173.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/83629049525.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/siviwizame.pdfIn PDF document text
    • http://santabruna.cl/upload/file/46209578839.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/bewop.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/worodonuzudazubo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e779c132---kexisoguw.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907191512.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/jirazawetupu.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/denolenud.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210917134917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=battlefield+bad+company+2+apk+dataPDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 11032 bytes
SHA-256: 0e0a581ce72a8f8cfa2451b351c5bd60aacb977595b7add9ba0143d181b14f65
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 18080 bytes
SHA-256: ecb279960e21154177cfaddb450cb6db441cb2731820f8137fccb61031984cda
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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