Malicious PDF — malware analysis report

Static analysis result for SHA-256 e828d3dce0da54ac…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 06:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7927ade3a04a906c9da9b0d53a004954 SHA-1: 7672de10c055c1ff03db4640b5022b693bd518a4 SHA-256: e828d3dce0da54acffe3f178adbe31262d4333f12e8ffe4a46624d7f9b9ae96c
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social-engineering tactic. While no scripts were directly extracted, the embedded URLs and the nature of the lure suggest a phishing attempt designed to lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://insp.biz/img/file/56188284794.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f56b55e---6486117091.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/80090925919.pdfIn PDF document text
    • https://posh.hr/files/51988060926.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/memiwokifutatixo.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/55501489321.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/30425684321.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/11827352550.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/koravupabuwemubavobewugo.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/madijukar.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/wekafipegure.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/68794722964.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/15361086769.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/5525261636.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff14531266---foves.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/rikadeletudeb.pdfIn PDF document text
    • https://tigaintan.com/contents/files/fukomevetebonewet.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdfIn PDF document text
    • http://grimastone.ru/files/94692384446.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/96675797283.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nebupigizana.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/81538685111.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/61empsv7cfcimuvmes5l2mb9r2/lelularadikuwof.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/36453640076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=english+to+yorubaPDF 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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 10592 bytes
SHA-256: 27eac9a3d31336e69424f3015cdb0b236fb8283b084abcff6b525d258a225671
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 19596 bytes
SHA-256: c9c2423f61535216d0bb68cd17054d7ec2f4b2c1889375aff8c2434bb4600a11
font_02_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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