Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0453d23add38141…

MALICIOUS

PDF

114.0 KB Created: 2021-09-23 18:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 514f94f051ae27c1c8ee91288f244ff0 SHA-1: fb1afdcbd1c53a6012b5728073f6c6b8fdce22be SHA-256: f0453d23add38141dfe1babfce859d307cc60b8036271cbd5381e462aefd5f99
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick users into installing software by posing as a necessary update or extension. While no scripts were directly extracted, the presence of numerous URLs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious sites. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://globalfeedindustry.com/upload/files/25610241558.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f5787af5---zefawinozuja.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/filenaj.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/giketorir.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458c5fb5b23---39879754724.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/44599426818.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/kumodawor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f5375bf8---fojaj.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/12336416898.pdfIn PDF document text
    • http://crm333.com/documentos/file/90153366487.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zawevalebatowofisugokewox.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/2831173863.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/99453090345.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bavolarovisip.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/betevowibulasolom.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/6357605306.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/87531282600.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/nezip.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/30316278129.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9573382b---bevozezilizod.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/pusoropufetejudafobofipan.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dowedagarowijowev.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614770fa0561e---jasonitita.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/kunotibif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=delete+old+updates+windows+10PDF 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_off00015a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8D 18156 bytes
SHA-256: d47a5233b73aac16243b74e23196cbc4aa0586073c9d1db558d0b70922533564
font_01_sfnt_off00018930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A147 10644 bytes
SHA-256: 6fb411d3d384371c2aa1202ac102b3703473dc5647ab234444972ad094e8286b

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