Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d960764b26578d…

MALICIOUS

PDF

105.1 KB Created: 2021-09-03 19:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b522f83e6ca839f2e8ccd6065dd4ba4 SHA-1: c3f6c3d331912195465303bbf46031243c78899a SHA-256: 97d960764b26578d5381b616d40a5606a9b16eb8cd3f12ea7a9455846487df97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content on seemingly legitimate but compromised websites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the heuristic findings strongly suggest a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://juhaszautovill.hu/userfiles/file/90802682947.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f0bcdc12b8bf1159f65a81531586a351/16247499237.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123a8e663753---83044554892.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce9e9bda7---20672163897.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/womiwa.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/79038797356.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fe6fb91ff16fab77cba9cd21624108e6/lanusixagimaxem.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9jiustep3jtn1oi2o4mi389qu6/merexefiwivif.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/97292594333.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a421be1b99---81142535483.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/91093895505.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160830ef22e735---96607731215.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nuxulegi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9c1eff8b033ee5edd18dc625d8014e4b/3908954813.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/luondmht4m0u5utu2m23v71buq/bibejiw.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607970065fcf9---80602220873.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/sigapu.pdfIn PDF document text
    • http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/mowozifuwofugafosex.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989224da257---3085319456.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16126fa592d948---36469500133.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/978941e6d1b5a6934d4f67f5588e8e7e/30456737596.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/sufegitovupag.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tigurirojez.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/77796373088.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeae492ab8---ketewuzozivalimimokowumuz.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/82244d01905e391dda8908741afd6d84/70981399463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=scanned+pdf+to+text+ocrPDF 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_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 10484 bytes
SHA-256: 89a3cbaba64e3ae5c9741fada40730d480ef69e9ff6d5942088198a44bd315ac
font_01_sfnt_off00014d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D17 18752 bytes
SHA-256: 9269e568ad9a3f0bf043af6a13809c38c901fee480fe6cb68ca38135998bb17c
font_02_sfnt_off00017e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1