Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92bb53b45669ce9…

MALICIOUS

PDF

80.1 KB Created: 2021-10-05 09:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63393427925d2652f35af44b4153ec0b SHA-1: 1b12e73359537494510737a5f0ccd900576e1fc9 SHA-256: b92bb53b45669ce9d50deeec13ce58d90b1843a3851a9f66f8f6c590d048dfbf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous unknown PDF files hosted on potentially compromised or disposable domains. The presence of multiple external URIs and the structure of the PDF suggest it is designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://nguyenthaotech.com/upload/files/96945793906.pdf In PDF document text
    • http://drxzhang.com/userfiles/file/88252064197.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/bavijagojupovivavizo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a178006522---23721345614.pdfIn PDF document text
    • https://pecintajp.com/contents/files/bopumuvijagigetavolutam.pdfIn PDF document text
    • http://na3.it/misc/file/wovokokalovimuso.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109031218345722.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20211005092929.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92265273835.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152ad49da639---13738848610.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142e84620624---gezoxeva.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20211001044910.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/xagafubot.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/97177199560.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/rufitepoxavam.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/51486981607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=one+billionth+of+a+secondPDF 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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 10640 bytes
SHA-256: 414a835e3811beb7095150ab5cf2958b40c1c13a8ddfdaf371b755f8cfea5714
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 19332 bytes
SHA-256: 2588466e0200174ee805689dccbdf5e49811711ba1d2f39aebfd92f9d0749ecb
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.