Malicious PDF — malware analysis report

Static analysis result for SHA-256 6158c22899ec47ab…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 14:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d84ddc9a8d284da0312f58c8f6a0634 SHA-1: fb08d1b3b697e15e008db91d5b0b318df5ab1676 SHA-256: 6158c22899ec47ab1e997e60f97a27bf6e79549bb7112278774201e3649b7115
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fajndoktor.cz/images/file/files/96390287295.pdf In PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210610_F93CEC1254ABAB99.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/39849316078.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/muvewedab.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e546b50e66d0966b4a0ee186831c911d/dukunele.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/serusuxuxowanulanimininaw.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210618_38DFAC51EB8F0112.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb6b62ff52---38217681501.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/34846900058.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///natararorilas.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/nozuvopuvepilafumud.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44934608046.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pogegibugu.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/natobari.pdfIn PDF document text
    • http://allasclub.com/campannas/file/89976782680.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50d823574---33847809367.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/vaperutexilaxofabomufax.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160786d73a813a---16104494248.pdfIn PDF document text
    • http://elitacasa.it/images/file/nuwabikapisejeve.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/35122912838.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/binajixodedelosik.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/wadurobesukazedaxe.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0690acf6f---dedogaxibidowida.pdfIn PDF document text
    • http://bjjiffy.com/upload/22295898169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bajaj+majesty+induction+stove+manualPDF 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_off0000c06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06B 15320 bytes
SHA-256: b9609a4edf7e933934c98b31ab697d04a01cf6ad3e8a642383a654e224c8715a
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 10896 bytes
SHA-256: 5c6a4c9e858d858cdd19c000f0cce32ebda51917adc8cf941bd81582b6a602d0
font_02_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1