Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bcb1b8932f8720…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 22:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a2d6a3e1b9a6c228905a8d69fb20a15 SHA-1: 74e0e6cb315a62682cb395b9ea8b3a745f5a9a0a SHA-256: 78bcb1b8932f8720bc0bf6afe8dec7ad0d821b72ea4e95828788c4ce394bf1c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=semantics+dictionary+pdf PDF link annotation
    • https://dgaspcsm.ro/ckfinder/userfiles/files/jozefenobaposusaga.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108210516542149.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6ea73956a9c0d646439cad8c3a75193c/luxoritatajoriwi.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210811_145759.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/91127311753.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/34663254929.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6752cfa3f---29982573136.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/53936777676.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/bbekac85eqnnsndul1vsl710fd/nivema.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/10442983173.pdfIn PDF document text
    • http://eventechsite.com/files/files/86795074116.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/jufakuwumaxinipewu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c552f7dc4db---zizoditosube.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8ko7c5bje59jlopbj467g238nb/10492177284.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/10375874748.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/51139803485.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2b835463a9c5ffea9acd6af803a8e2d5/57410212463.pdfIn PDF document text
    • http://indel.sk/userfiles/file/64184548724.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/eepj4elkraagto6s9u4l6c2bb0/lalosiwawezofodepidage.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/so9b6lbke6tjoqvdm7ijfg6dt7/buxisigesasut.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bf7iikk443niq9nin32v4mkl90/romoxewugib.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/togabe.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/kawerarupolorowiseluj.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/zekomex.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oi8eitl5v3ujs8ph2793qcukso/48389747549.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_off0000bbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF9 16504 bytes
SHA-256: f9e83e1cd432514f72b6a33379b3b9abf2bfad8c6a4f069759d1747f37f144fc
font_01_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 10924 bytes
SHA-256: c6fd135285b8a5638551f34395258db934a3c9ec4e51000beb1585077f81b032
font_02_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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