Malicious PDF — malware analysis report

Static analysis result for SHA-256 1264d7d554258302…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 02:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f00e801820eaf7373d0cc5d23d3e17e4 SHA-1: de2990bcb053509dd4fbb1298853667a1e3ed905 SHA-256: 1264d7d554258302bdfbf6b4d366282d5f96c7bffd4d0740d26f0274b59e53d0
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest the PDF is designed to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://quick-thailand.com/images/uploads/file/figewudagufux.pdf In PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa05c9247---65541835619.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/lobajiluxutaxe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608489e9e8878---gifeno.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/95154109114.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/37779977840.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102c8271cb88---31979901062.pdfIn macro / runtime command snippet
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f590704f266---21320728218.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/piparosixewi.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/garudulabexa.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1d42755301d9f5766c24621ddbcec955/93141080854.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/nusufakidijiwijit.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/42143128593.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/dinepuxulet.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9e2aa68937d5723d6955c5c0b19b38a9/kubedivufejavivuwigez.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9975f43e52---1806435044.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/fogatixajuxanukorotil.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jogubijuk.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/puwomewu.pdfIn PDF document text
    • https://sportsht.com/usIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ks3+maths+percentage+increase+and+decrease+worksheetPDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 20664 bytes
SHA-256: d66a9262163dead76bd39177b355c4542a6d1efd037dab870a0fd23b93a821ca
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 11256 bytes
SHA-256: 52bbdf70adff3fdcd0ad1551fd382e87e3e2d51ecedef3b68d64c40495bc444a
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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