Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2d2324ae8edc44…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 01:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5f3a95f681677f974768581fad18cbf SHA-1: 49be8d34b24fcb3ea84eba99ee51020c889ca4c2 SHA-256: 4b2d2324ae8edc44733f9baf2e0e5dca3bbe843c182b0ecf9f36f1f237da4f38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=play+store+download+for+samsung+z2 PDF link annotation
    • http://cafemsoffice.com/userfiles/files/kalopofawenukuginosi.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/mafugadununisesudimomexa.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wufuzasavabejefugozu.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909204508.pdfIn PDF document text
    • https://grnca.org/img/files/files/50966860685.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/xatubimenedovafuwakesejas.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210914130004.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jatitenelerabapibaju.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149e522a89d8---43916622267.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/pinorutekafamewi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133615b7be02---girikataxufiv.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/53317892592.pdfIn PDF document text
    • https://grancom.by/upload/docs/33502486814.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/ferafidezotipezerodebex.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/peseduno.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/6393695327.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/tekasidenuselukuwaranifa.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/46262452686.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109061331557246.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jilavatesodut.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090300094598.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/51096248095.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9e2qr4u2mpmeomf168k0cupdcs/4310427544.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/96391017325.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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 17484 bytes
SHA-256: 04e162c770d30f4005b5d4c5133dbabb1f8d094d45ea66048900e0da9ae7ff03
font_02_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 11088 bytes
SHA-256: 1c596a837b384d81be8140dcc1f7b4aed22cd3dd7da952d9e48e586d270c885c

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