Malicious PDF — malware analysis report

Static analysis result for SHA-256 717c88fc741ee59d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e08e5d6bf790d9c64d1d3cde9cfdacd SHA-1: dc3242e62aba38d4d1011f6cec4865105c6fa758 SHA-256: 717c88fc741ee59dcaef8af4c9d461b86491ea6b09e00899ebc286c7fbc0e84d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449925445b---xejupodojepemabujitijum.pdf In PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/luzolulananaxodepawumonej.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080f25f93cec---11365502714.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/dipegawenefufizagirotizip.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/kixanipuzimotabewumif.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/vorijoterade.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/weridajuruwomisadete.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125715ebe7e9---dofol.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/gejikugasafitufe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160705ceab5215---lasagisesewanoni.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a0b5a4aec92fc58461b4636a54a9774d/pobokalazatisulufofe.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a01efe82cda---88506699900.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eade176f---lasobuvazezakitisuzeveb.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/95536535510.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/52316485993.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/zusawutajuxugure.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/69970769536.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/21286126225.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/19q6rlm0arucoo1egsfnqv9nnh/40991509245.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/34190317831.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a9b68b82---nevasasagalolubizu.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210728_766950B428290DA1.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50ce1af7c---tijigonobujebafinopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=carrier+30xab+chiller+manual+pdfPDF 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 18192 bytes
SHA-256: 2f88d2368f35523954d614ba23eea4db8d4a57f0ea414cd494d9c4e029e48347
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 11168 bytes
SHA-256: e5348147e0d5a323833b1e67ac502fcfdb1e0a54faf9a5e6919ed073a38ce7d9
font_02_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1