Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eca11738a8a89c4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 17:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47225074cf644799dbf79d00259c7c47 SHA-1: 83d0d3fb3418729bc619afc7118d388446120321 SHA-256: 9eca11738a8a89c4fe61f27f1f36c7740cc3375088e4f657cdfd7aa0819df590
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 links, some of which point to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://metisentry.net/ckfinder/userfiles/files/waselowejekonumujig.pdf In PDF document text
    • http://yuanda-boiler.com/d/files/nejodabajunovituseziva.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/26201348788.pdfIn PDF document text
    • http://saimiri.name/upload/file/lisewibo.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wikezedelejile.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/rugujemepazolusidufap.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/74403209764.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/96140706313.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1f5e77ec---15892766479.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f615a6866---67327840905.pdfIn PDF document text
    • http://zuche0551.com/upload/file/25402844476.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fabagorozezixisibovez.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210914114614.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/56633637705.pdfIn PDF document text
    • http://benly-carson.com/product/files/xizabedoxig.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613745085d15f---25746795694.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/wopukekonewakolimem.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/reduvizabibavadigefifagas.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210907_CC2A211BD76D2EE5.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tulonufobi.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/powovozap.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210911220158.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210902120520257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=office+product+key+for+windows+10PDF 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_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10996 bytes
SHA-256: 667504d6a7c0571ce74f6ac8f67e46c0cd035530c2dc22a6c096ad1affc3b432
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 18580 bytes
SHA-256: b1811b675ce245eb2976fe2864ee9c89a163635fc4b433f406f95c0ea97d5ef1

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