Malicious PDF — malware analysis report

Static analysis result for SHA-256 6718514c72fd2f95…

MALICIOUS

PDF

85.8 KB Created: 2021-08-27 19:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30f8058ca6c8df0b2d4f0ec0bdf8efa7 SHA-1: aeaab2e61382d6a9b2eace50738022b318d74385 SHA-256: 6718514c72fd2f951ecefb0e6994e550228e40405b1b1736c3816088d962d270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://crysiq.ru/uplcv?utm_term=bilateral+double+vision PDF link annotation
    • http://bronia.org/userfiles/file/motimex.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fcfc0841d2f8bc8fab9e1a45a7d23978/36249467845.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/94791864348.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1bf2270a6---82300260430.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e6e7738b36fa2164fe499a5fa25567f5/85646618749.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/ruwapazudevi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/mudedepubawexit.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f12f49e279---zopolekegigeke.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/tobanejajujiru.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vaxifeju.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a596364ad4c---nataxijum.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/96671476952.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0cc57346---danadiruza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8b15bb2c---fagaximafotovoji.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/10185824109.pdfIn PDF document text
    • http://recviem.ru/img/upload/nurire.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/c5aqntt1oplm178pg4aqhrj981/61055639225.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2fd4d0d26b7d6eb9b12b83c5c2eb0370/50402465404.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/44481031679.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/86426073921.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3aee0447c81a7c92f6b154c0c1f82d29/ziwapupun.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7aeprtgs9f1535i118nl6etfv4/vujul.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/94542487709.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262a606f88---wapavabedirasadikekafu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4f647267---gavaderu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a13872be843---92272400492.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160858f2d21bd7---dekowud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 10600 bytes
SHA-256: 76c9ca3afbb5db164cd6bbd3e4f8231ef3d10b7118510a06f6ce785db0d6126f
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 17524 bytes
SHA-256: 5b1a5ecfc991073b337383ec16cd1ba6d969e132a770b878036a8fa2b218c136
font_03_sfnt_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 1884 bytes
SHA-256: 1a02648605b077effbb842b083c66b0e466b44db270e1c986184627c8f77afd9

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