Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca97835b8d2000e8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 21:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 712a75f6fdf81758c02aac5ae66cb938 SHA-1: 823a27432e42e0bb65faf078e53fc62344c487d1 SHA-256: ca97835b8d2000e86e188e86e31bd9c438f4f498662f04fb76adc23164abcf3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download further malicious payloads or engage in phishing activities. The presence of a link farm on compromised CMS upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=maurice+bucaille+origin+of+man+pdf PDF link annotation
    • https://jjpremiers.com/files/54562827611.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2e935d4fe4e060857b31339baddd509f/75356644217.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/gisubelopofogelu.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/wewuribewadibejowelobaxi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070acecd397e---refelux.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fikarerimezupiko.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/remuwujuwevar.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e2958cf9---19361359138.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/12050216254.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/94143739948.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0874756c5---25736841040.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/lebusazakatimu.pdfIn PDF document text
    • https://termofriz.rs//files/5726056561.pdfIn PDF document text
    • https://ivanamihic.com//files/78524652457.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080de2e44822---gejubox.pdfIn PDF document text
    • http://sun-tes.ru/files/file/4360302049.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kulaleboju.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/61029648456.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8622fd7297---sefinewulesanadifo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a057e02503---xeriraposej.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4707d172c---xuzarujemepemomewide.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/mabixivilakudav.pdfIn PDF document text
    • https://lasanisports.com/files/343664186.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/birezi.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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 17304 bytes
SHA-256: d14ddb1957cf0922fc7b55eb432ad9bf9a6906ca1d1a501c3383e3a769a6501b
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 10932 bytes
SHA-256: 3c3b534d75308dc855c5ed292fcf82f0fe4462891c59f6faa187b681c3b131ae