Malicious PDF — malware analysis report

Static analysis result for SHA-256 0924b7ab64016706…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 01:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd1c42529321b7d0d271cc1e11a22617 SHA-1: abb1470e04dafd350836b0aa135db6e00a890789 SHA-256: 0924b7ab64016706ce8283a79425d2d9535d53fd368afc3a1a2620e84547d052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://meesens.be/KrMee/Tekstverwerker/46057879837.pdf In PDF document text
    • http://shippingengineering.com/files/ckeditorothers/lujurupibinal.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/9796131045.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/23ec9pmhbroo7ms8ko6rf7c7pd/95669986680.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/lorebezo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bffc61fbf9d64eccb0237613ce17362a/22674053929.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/zovorufekujegupulofuxa.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tovenarerumonap.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/55577df623a39f8dff63808366674eb3/javiware.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/57427407357.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/7671393845.pdfIn PDF document text
    • http://arslanemlak.come/file/gumuniwu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f740b787c84---37026733584.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/36207760154.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebcda0736---telafarizubagakuvab.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3a8dc5b9bb45fb66f97fd2b64f953bcb/16056472765.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/kubosifusalonaxufal.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/letilexoburixorubada.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/buzalabidemetujoj.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4df52f24a---73588096357.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/11913387955.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/bibojetev.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/birupexamivemiwanamub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tipos+de+virus+del+papiloma+humano+pdfPDF 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_off0000ba38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA38 10796 bytes
SHA-256: e1e56b01d019d7f5d378aab50d45171114bd28b18134989168530242a22f7868
font_01_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16100 bytes
SHA-256: 5aaedea124058b721bc819bb728b1e5d5b34269c333ea6960ef50edbb30f7ad3

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