Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a488a1129eb1bc…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 03:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53695d5fd80bcfd29656f0daee6dbfa8 SHA-1: f4525cd93930bacd1c62eb168f7091039f930a61 SHA-256: b7a488a1129eb1bcb102d2e0fdf9037ed2f854d8ff57d5701a2c09547ce432d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://bcslaw.hu/admin/fck_upload/file/45433863864.pdf In PDF document text
    • https://tierlistei.ch/downloads/bexigirini.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/adc8e2cab28b95c867c6f94ae3916d89/61960462198.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/9507016765.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/zugul.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/93770618850.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xozoruzimebobobunulorab.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2f59e9d311a5adce733a7df5133fc7f6/robebefekako.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a534beab894830ea2a0b4d9432ce2a64/nelela.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/vexorafatixepapebevifosop.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb86a23bb1---94837405773.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/dizakejoladita.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6f3c82ee---gakezov.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9b20bc2---2802173605.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/2083852871.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8276245c16cddf7dd7d7f56ec3499b86/pekekuwojibab.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/51573284135.pdfIn PDF document text
    • https://parfumzone.ro/files/file/tazanamevigirefojimon.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/goxowijoduvu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136822759930---26714592371.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/nusizukup.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/tipirukanekunofufisa.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/86790241162.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131537421935.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614120e3615af---54928779745.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/zovewidariwawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=roman+graffiti+pompeiiPDF 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 10532 bytes
SHA-256: abf5a31e416da814bd1bd381c0b0e1456cb7374b0e00bbb33b31d612e915ceeb
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 18172 bytes
SHA-256: b2f7dbe1e3585939793aee609a44cc3483313106750889d0ad50fbbf63987a71
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1