Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef226708c615758f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0004b2bdc96612eca1d1f1e889df48e SHA-1: 4feda21f445a19f8a24aa3967deaafce43982343 SHA-256: ef226708c615758f9a3a87013e38da9e0b83845cc6b2d80111e883965710a396
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The embedded URLs suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://prepearl.com/uploadsfile/4738948997.pdf In PDF document text
    • https://mmeasar.com/mmeasarfiles/file/44196868480.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/viwolugufuzisogosuki.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xiruwipevijadonaxuburabi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vozexokadaduvozoruler.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/puvevepog.pdfIn PDF document text
    • https://eventaipei.com/upload/files/82272321888.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a862aae68---verunomakepof.pdfIn PDF document text
    • http://kahasat.cz/data/file/74118908876.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/77194275391.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/81836379164.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/kepopedetajore.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/pukanewimomokot.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sajusivirutunixibimawa.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/82688687364.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f7ea63f2---rexapetejefekip.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zokukonadu.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/basidobawuseni.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/jakafuxidixiguxi.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/45102007222.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tesuga.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/jowazo.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/gefizofogarasafad.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069d172e28---79247735889.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-3/20210903083327472031.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/wavaxawejilevatajuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stickman+combat+multiplayer+mod+apkPDF link annotation
    • 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 11028 bytes
SHA-256: a6be39e12b593b0c4d586f1525be639c52e3c3331406cdb591d69c1b975e6038
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 17856 bytes
SHA-256: 1adfdc104ee581f6895915f76cd8475914ac959c0254cad91189e87b9a287f74
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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