Malicious PDF — malware analysis report

Static analysis result for SHA-256 6769dc4388d321e6…

MALICIOUS

PDF

98.8 KB Created: 2021-07-06 22:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7b222fbc057160a848409d3846787c6 SHA-1: 535ff363c75cecca8b3ce783a2f9f3dbc6bce197 SHA-256: 6769dc4388d321e6a2ae049b45452f1e6187f965c0d5cfbf9c7ae03e37a3337c
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a visual download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=dls+2020+guide PDF link annotation
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4314212eceaed42a9598454c9c611349/30938891463.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c637c88bd---tixopuwux.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/xodutofatuvevoxodovoti.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/39813683110.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/afd1de541bd22bdc446f338c9bca88b1/38102677621.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/94125787928.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/71739067721.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ur6anf22ga4ct7nedtuld77vt1/95597018760.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/62264415219.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7ede073b---47428167436.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095fbd86fce3---gagotofisunitorerowemil.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021070305023073499.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95a69e243---15643710153.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0c64c30d1c5c11549d32d42688c6e916/gebufaluf.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a2eef2ecb---26319987166.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855b7d046be---sepeweligaxud.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6bb756a71fdbc7e6390f47b93fba70e0/98374748298.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd0b608e6---83478250528.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/61d82b8e84694b8a6f9d38b1ac28d082/nadowemoxawik.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/a66486dfe577da942afa1001823377a9/77409583240.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078078282fe6---xisigu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/32103327233.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/50805216790.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2ab016d78e90b7970412d68dcd7902c4/21088536321.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b90184ea76---ritalabisemajep.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_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 17636 bytes
SHA-256: 9cc45c869d3c5495dbcf3df4afb4b0c8ae4c187632960c268c929c5f05ad0ca1
font_01_sfnt_off00014f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16793 10184 bytes
SHA-256: 23fdb1bfca208bf6986599bfe9269cfb2e4a80da5cbb590fb79d59d28155aefd

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