Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b68b1f1762e865…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 11:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 894c8db90d7c57a920ca5af2cd3a09a4 SHA-1: 4914c7ae2d1f5d7224034e541462976b8a0dd599 SHA-256: 33b68b1f1762e8652aa6c0140b0feec4e9715945c2ef2fba3f15902e8764c93a
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress uploads and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URLs, some leading to other PDF files, implies a multi-stage attack where the initial PDF serves as a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=motorola+baby+monitor+manual+mbp36s PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/34441dbd3ee384ef535f22ba1099d1e9/porubusegaxemejabevi.pdfIn PDF document text
    • https://rasorestefano.it/file/39877631771.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kekeposuw.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3b677cbbbd6ad1bc4e6c93139d6933a4/jolozikekoza.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/15456357732.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/4202070419.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/jofipuz.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/21359468373.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/badenigonuziwoju.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/bipopidezi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bikotoxenipuv.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xuxoxi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/430635e21f14b8138111df67191968b0/25567840808.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/67673037595.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/67302366776.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db94980424---durugob.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bopugaruzif.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091204c77e06---91847108142.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdfcaf246---69644848091.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/76930224277.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/tulukiwuzepevexim.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/a1r8gcnmag2ilcu82ts8d5o4g3/jigiwo.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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 10968 bytes
SHA-256: cc155cfeda18615405515c45e3a2c51df4c374d5623f9256a472e7c40f6cecde
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16412 bytes
SHA-256: d50c8f73985430ef64034423e5b121218adf03c7e0e92ca833dfe096923f7214

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