Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7b483901b9c008…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 03:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e48ea329e1b2d1247a628a1faad44da7 SHA-1: 9618bb0835d3624be8a39ba156fc62fc3ff7ae73 SHA-256: fd7b483901b9c00869ee251ada1956daaaa9fa09f17a95ed34e101d432228ea6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are associated with compromised WordPress uploads, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.anclupnapoli.it/userfiles/file/rebufusalula.pdf In PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/90007537931.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/zones.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rixamiji.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/wodote.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/m32k0el4v8e8cpi40ksfmf40dh/57508643000.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/70613882034.pdfIn PDF document text
    • https://flomogroup.com/upload/files/puxukozemidudobipujes.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381fbcefa93---57280724221.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/17519543771.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jegivadof.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/99658042458.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca39118b66---sipolevakizuwonanovuge.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/53552319769.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/39701901686.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/fegamevaf.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/8105631164.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesomagefumelotibefifo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b1c3d673---dexajulizekunebilomolenoz.pdfIn PDF document text
    • https://artenika.pl/fck/file/latagoxowumaxamejaf.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/90754642598.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/4017244800.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/xosivodopetaveruzomaje.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/750438134.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135537f37c70---pamojesemabuwola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=calasiao+pangasinan+zip+codePDF 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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10580 bytes
SHA-256: 83addf7cfdd6cd545c07ba822ca39aec86db6be1769730dab5d4bd1f776eb46c
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 17836 bytes
SHA-256: 104ab087dd751ae76b296d57ac80eb5cc1c6f77cf0f2cacca12f25fc84e9b376
font_02_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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