Malicious PDF — malware analysis report

Static analysis result for SHA-256 87293e9f1070ae05…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 21:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 104059c8e2ced3468649128b522850bd SHA-1: 111aee17986d38cd441952833d1547b68e45ed7f SHA-256: 87293e9f1070ae05f04e014c54bfc68657f59c1ea96f0e6b3b471bd27e571bac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but reinforcing the nature of the file as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=android+game+dr+driving PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a00e479c9e---tadam.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913023248.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75843914419.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/93349061800.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144d9e13b663---18603113554.pdfIn PDF document text
    • http://tradotel-riviera.com/file/24721119717.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/makofepafafez.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72376295803.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/25621252081.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/67740693892.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kuvepovemakawegefafiva.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/gusesitupa.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bipeluvuvapitinipuverute.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/kefaxesin.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/30934816912.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1fa6df7a---97082473156.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/12736797275.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/53402447623.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6675ef736e77b35d74102ac492a3526c/73728948283.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/dimajaroka.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/66496397376.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/85050189095.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/luvoleledaradejuluvev.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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10324 bytes
SHA-256: 50ae727931318d8814ec842818231e2890decedc6a035281dd721ba39cb28e3e
font_02_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 16400 bytes
SHA-256: f277b11c02a41629accefdc1e1aac01d8fb29a1de117855bb7ae7f34858e2e34

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