Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc40246b90799ac9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 07:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8df9bede7ad58bf5767652296562936d SHA-1: 9e84f829c3033f95f71a17cf2581c7d9be841cd7 SHA-256: dc40246b90799ac9f9707e7cdb9bb31cda84080d6a257e58807e5e7d4f1ab308
196 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. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing software, a common social-engineering tactic. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.esfa.bg/root/ckfinder/userfiles/files/kuxuxoboboleparaxe.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b167f7251e---63118186497.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/worufunululiguwotat.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/65806290421.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/ruzuropobadenobupakunev.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kaxowuz.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/pisorasovem.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/22808323856.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614291040eb5b---runexugukedutebasuwanoxov.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a5319312adbf343ef0af7aa885408cc7/43914226072.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/98635015593.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/bozobixuxaxudeluwimu.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/69123108787.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/duvojelofo.pdfIn PDF document text
    • http://floramarble.com/uploads/sisezap.pdfIn PDF document text
    • https://zzhqhi.com/d/files/bivujuzeripenedibo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3ra9p5lufn6csga7c1344alpqb/bokozer.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/42423466254.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/98837120683.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/luraj.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/96815125101.pdfIn PDF document text
    • https://alev.az/userfiles/file/zeguzesixawosuxokemavune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chrome+toolbar+bottomPDF 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_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 18836 bytes
SHA-256: f0c6c5b03f71555327d2cb069196201fa8f846ecf07161e1073c3b66c1639e8a
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 10180 bytes
SHA-256: 38554204b89e025529e1e472fd2769ed8f1dad7680846492eaf749e24d93beac

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