Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6bd8747465a67b…

MALICIOUS

PDF

79.8 KB Created: 2021-10-06 12:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01fe899eb77a1ae45cac603d17b18c6a SHA-1: 0c0bab5f3964376c64ec05479485140b59ac9a4a SHA-256: 5f6bd8747465a67bc28d46509896452a819024c2531ed90fc777574b6b85ed50
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual content, but the heuristics point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gjbuyerbroker.com/userfiles/file/527623712.pdf In PDF document text
    • http://netmode.net/app/webroot/uploads/files/2719346703.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/kofesipukol.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c28dfd12fb---tugaxuj.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gonozime.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/3708631693.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/tewalezo.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/kabolilevomamepu.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/fakowatuferibisemilobum.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/bivumasejenovix.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nidigogazuferenuxawej.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540d35dfc40---kakuwupurif.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/powaxozufovonasekemazifi.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/bapezesobasaki.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109170924412556.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/83018946470.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f575d1d696---xanulebixesopaxarukik.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ciu52s3t93hek2m89d532o83n3/4071586550.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f7d8299f31d824c475bd06fc0f091d7/lelusut.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131087acc90e---62578411363.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/75201086588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what%27s+a+pdf+readerPDF 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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 17972 bytes
SHA-256: 56cf9841807af726fa9e6898d07049cdcaaa9aee9bac894a6461bee6644022a1
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 10260 bytes
SHA-256: 5cc03b30315cf8f050add6faf81a9305e572889699a4560b47df147450a6cf7e