Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b1d41ba51ca53f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 17:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e6477cb324acbda48488c0c5f6f4dcc SHA-1: 8c934e2c7b0becfa59446d04eee75c6b9d4e3af6 SHA-256: 16b1d41ba51ca53f469b04a201f72f6019d9900decc20ac5ba6484f0a3d0b7cb
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a second-stage payload. The presence of external URIs and IP literal addresses further supports this phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://antonioruizabogados.es/userfiles/file/nuzapomofepelesejizep.pdf In PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/jovos.pdfIn PDF document text
    • http://hkalc.com/userfiles/41340288639.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936ac5c269---vibow.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e7688a5a---xatobakawavibove.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/34619949809.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/juvoxoroxevonu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c82db3f12f13b0104a2a92956e6c551f/busimujumajijasanulof.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/ledoz.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/difomutevafowa.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/tugezuzuwijojiw.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141638427c9c---gafupume.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/xofuraguzuvurulazij.pdfPDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ca870d77---sukuku.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/vagimuwelovegese.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/tirevafu.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/mesazelapudisosupulo.pdfIn PDF document text
    • http://vce34.ru/attachments/file/pabizeled.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/72990359527.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7c94ea140---vexijadadunemorulan.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/64639882496.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/13389423837.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/36043276662.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kogigubumuzewabi.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/79179670511.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/mozagani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=convert+pdf+to+bluePDF 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_off0000b62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 10404 bytes
SHA-256: a9454e78870362e79cf9acd840d9ec7cb1a85ffa5b536f794849c810267ba42b
font_02_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 15404 bytes
SHA-256: a732cbe5f6220b855f016756fb73085d6ee472473027739d5d5caf9cb4b5b29b

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