Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60d99a8c421dc40…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f59605a03ed992fe3b1d72888c2d1d10 SHA-1: d23c0cb46baae68a5a7f8eb5369dfbe99ca30e83 SHA-256: f60d99a8c421dc400888152f717c2ad8f85b095a20cb386ed1de99c430c0e20c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content or phishing sites. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for malicious activity such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=what+is+a+adverbial+phrase PDF link annotation
    • http://caratow.eu/userfiles/file/pipevununedoxiloxow.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rezafabokowawusidez.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/kumanarivewonerulaja.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/rixemikeb.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/91359486008.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4636dfad4---pewufe.pdfIn PDF document text
    • http://come2menorca.com/images/file/mabitedaxizuja.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/632475391.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16270744528776.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/23035633647.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/33174545082.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/fupetux.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/75377193548.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/gajuwaxakirivetosit.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/runumafubukoteraloridij.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/wozofafuferu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/pukemukefupepakumi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/30357acb7d66fc78873ab377dd77068d/jubanewerumilatu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160926adfadc8e---56512497634.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b5b24878---viwizifulonujifesemo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/99190203755.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/51163334259.pdfIn PDF document text
    • 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_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 10464 bytes
SHA-256: 1a7f10e27c01323632048bf6774bd057e72391349ade71c585a3269aedd42bcc
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 18044 bytes
SHA-256: 2d2c666406a0858e0e8654ee0d5b153012304dfafc79514815e625c9e5881fe5

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