Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52bd12ca7e0690e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 01:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 618f276739a3017dcab8965e30a2def9 SHA-1: 7f2ba82cc978e49a6bf92d58d04ec25b969b32cd SHA-256: a52bd12ca7e0690ede5a2a78b40fa617ae4281625634fac6f13bc23220ca7c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://247hvac.ca/fabulous1/uploads/files/35854861493.pdf In PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/43198498011.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/vomapa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf20f03aa2---62496628471.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/80788700482.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/abvtgm6pluhb2e0t4a486i20q4/62204892450.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/wopededate.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/12815903600.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2031a34ee---goxexogokovogopuridur.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/wimopukobuz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a947082b28---80151623935.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/40360288609.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b9ba4d499e0accd152801b4dfc7b9aa8/bidixapuduk.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609308ca78ef7---fudilubirawu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a3bf0042---28244271813.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210825_BFD8775DF6D96338.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/02e07e19b31068d418f9fc07b9b18237/23587890733.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/34f5f5sfh3t9usu7hn4kg3mho4/pidagevawuledesekokoki.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tvqk67d4i476uuvv9nrae3183g/xobusumu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803da9ca95---dakufarejufevigupe.pdfIn PDF document text
    • https://congchung7.com/upload/file/rurarofidozokasosat.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/fixofevoka.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/niselewawadanakixi.pdfIn PDF document text
    • http://jkohut.pl/file/79484113500.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/98932997835.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/30044271825.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/24477206512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=medidas+de+posicion+estadistica+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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 17356 bytes
SHA-256: fd0099dd851801e43834deec80a607a560c9be779cc3cfcdfe21a5489d1f2b8d
font_02_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 10460 bytes
SHA-256: b42a4d03389a26330675f5a5ae706b4115a96748198c269e71d53d064fd591a4

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