Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b7227c739a9025…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 21:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e9bb67d358e34517bb5ac80d7c7edf0 SHA-1: 0f8e8e1883f3764684c67dd71aa5802ae790952a SHA-256: 92b7227c739a90252417f5bfc807d8698ca69d14dc08273f9cc27ba2b94c101e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, forming a link farm likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=urinary+tract+infection+pediatrics+2018+pdf PDF link annotation
    • http://pwmtqatar.net/userfiles/file/89509214883.pdfIn PDF document text
    • http://budropol.de/Upload/file/70603377609.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/8303463670.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/66835888388.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/73844211857.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/jegaremadatulapozib.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vikeritumofuwozubit.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c53051d3c61---powetoritudavi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6852f92d---61843078471.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xofut.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1302ce03e49ad13cd03a6baa2ca3f788/kizeteroxuporato.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9e167f632bfc590deebae1877137292c/telajor.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/88146143311.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210615152939_3vv7bz.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tizalevisatozazuribulutox.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c312aa3b62a8c8e7fbb84f89d56e26c/rofifokogumetiteveg.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210823235543168.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/061083a5a0ad1c27763949d53a2f926b/nojafebezomorupu.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bedadanigalalamo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/100f8568044c89d7e2b1c0291e58c7bf/lafomebuzevekewago.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/42618079255.pdfIn PDF document text
    • http://topp.pl/_topp/file/faweguporib.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/69395773431.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d5d011269cca4c8bd24deac5bde0a527/ladezetigukabapabebodedug.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/69866697756.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/61743485104.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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 15804 bytes
SHA-256: 1567f92dda319220210c51f103481dc815fb2663e8b81407ec921b4a5c57963c
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 11192 bytes
SHA-256: 8b9466533ec441e42ac5913cc6c13c57d79565e4f204708663a114151b26aa21

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