Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa957b79c978521c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 10:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5543ba58d4430e85376d0fadf4476729 SHA-1: b453285c4353ac1e62a0eca70b41dc8da228ee7b SHA-256: aa957b79c978521ca5636a3e2bff2131a87389708599244dfb4940e3f9ecb42d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The primary URL, https://coretry.ru/uplcv, is designed to exploit search terms, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=free+google+play+redeem+code+100+working PDF link annotation
    • https://jagamimpi.net/contents/files/polozu.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xugetozifuxepixojizegizod.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/81020909909.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653a80f01a---fuwenuzesigoz.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/62887135202.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82963989313.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/71557388618.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/33347744649.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/3324168257.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/78780106739.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/tonomulul.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136275b11378---18591141874.pdfIn PDF document text
    • http://bienbao.net/uploads/files/panuba.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/75065538694.pdfIn PDF document text
    • http://beijingteye.com/upload/files/89078520254.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/vetepudegugibuda.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907010357.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vt5iiso7m1vrcp98o8rqkk3ov5/25485721612.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/80022299944.pdfIn PDF document text
    • http://budropol.de/Upload/file/taxikufaxawexagawuzegiga.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1df597c9---24759643107.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/dibexomivutubo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/pojerijitumurivavov.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/zivosufof.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/73235235849.pdfIn PDF document text
    • https://faceless.me/userfiles/files/9561322296.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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 11036 bytes
SHA-256: 34ab6652c56d25be782c9fa7776846bb9866a680bb6d239052a5200941968d13
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 17960 bytes
SHA-256: c790f1220e0bb05e134711ee573d23325f6c68fee703c75d1b738e9257e5e3bf

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