Malicious PDF — malware analysis report

Static analysis result for SHA-256 93af72c2af6aac1f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31fca0db8c7eacf7f3a545d208b7c092 SHA-1: 7db29c6d9f88f02444d4c5ba345a92a2b82d7eb0 SHA-256: 93af72c2af6aac1f0e5c63745784f1d1004d22a4dc3778485aa214579c68551c
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'Password-protected archive lure' heuristic further supports the conclusion that this document is designed to trick users into downloading and decrypting a malicious payload.

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
  • 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://inwebjor.ru/uplcv?utm_term=lightroom+app+download+new+version+mod+apk+download PDF link annotation
    • http://robertoantoniz.com/resources/original/file/81279794689.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/64388308300.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8cff250e0f74ab8d96d5820022a61f24/73979714136.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa27b0c1a5---taxagiwumo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/33cae05ba0a9c10c7a01c32d6cf78f96/67028172468.pdfIn PDF document text
    • https://subarini.ro/mm/file/57770531507.pdfIn PDF document text
    • http://btsis.com/upload/ckfinder/files/bubegedikawetowotovarom.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210917_D0CE10ABEAAF81D2.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xajaze.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614389b5e7218---muveroxamofamuxuwed.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/82755272363.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/vobotasozeb.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/mewinika.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/toxuvikila.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/93261187292.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/55575716428.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161418447be2f2---zevuregifaruwakoka.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/90552984380.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/xoxakofudoluwojebukeku.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131444018f2d---tidax.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/32817270748.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0de37c54e---nugofapuf.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fikebemevodawogorare.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/97042097835.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_off0000b8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D2 11040 bytes
SHA-256: 4b72190a7a24ca68c5f0e2c99f8d3e51cc850f3734eb1d55a0e916fb57ada82f
font_01_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 16864 bytes
SHA-256: 8fecfa06c52eeaa9ab6931e98adeb22394f5f345505ae6ea5624cd5a67167c16

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