Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e465db93d642c5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 22:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe8f334f4bc58128c2b2c27fe4f7fad3 SHA-1: 98b9b8d6a58feda23f07d3886b07147d02212801 SHA-256: b4e465db93d642c514689be3818e6fefa5bab1c7f0527818b28b41250a773136
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update, a common social-engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious sites to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://emailreceptionist.net/userfiles/file/17658836708.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/100aef92e793ed9d0003871cbcc0f8ad/92460430559.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341395d7d8e---7120441030.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/68750312332.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wobezejepo.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/butefibubig.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/7277967167.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/mexisewefaradisumelig.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/nogoviginarowonarumuxabi.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192111425.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/tudiruvikerowodeworo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f182bc256---timojavedifupe.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/60211664196.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/bajozovalavufeja.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613416d14dbc1---92814158884.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/77563473469.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/45321810623.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kerifedamowebawopirilex.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/22563262681.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/65071222840.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/85621862513.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/noweresasulawov.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/49919976671.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/pavavuzef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+conjuring+2+mp4PDF 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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 17428 bytes
SHA-256: 02b12b1893c131f29943b8eddd9bb67ab55b86ff9f9312f89ee511e168bd8142
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 10736 bytes
SHA-256: fc269b6f5af2e78666f773a8b07a3dcefb3d240c7227940aa90f7ea7925c5d6d

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