Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3788b6723355009…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 03:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c21e0a00f6e7246d3b8e558ae1f5428 SHA-1: 3949d20ab3ea48d27051e4ed70c367b1874d0a55 SHA-256: d3788b67233550091ff935fce26c47c8d963c2d3d67d7bf59a734081f9d1622c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external links, including one pointing to a raw IP address, suggests the document is intended to redirect users to malicious sites or download further payloads. The heuristic findings indicate the PDF is part of a link farm hosted on potentially compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db9a5adb4---1254633662.pdf
    • https://mariellatriolo.it/public/file/xidapivewu.pdf
    • https://onlinendttraining.net/files/vuvurivakavo.pdf
    • http://traiteur-ribot.fr/userfiles/file/vedituxukexozu.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3e0a3158---lidevululikoradikusanuto.pdf
    • https://aduanaldelvalle.com/userfiles/file/bolitupaduja.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ia4f8mrig5cgge9qgvr2ij3lte/80160809712.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd10aad76---panifasupoxewoxuramo.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6693445202---tijodifi.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b580639732d4bba2ae23c730684899c8/38229034424.pdf
    • https://alamansyria.com/userfiles/file/bojefobesufunusubisokal.pdf
    • http://donauwell.at/userfiles/file/926428687.pdf
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/ragix.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac6de22ee---muzefol.pdf
    • http://altiro.nl/home/tjerk/file/satujowofezof.pdf
    • http://j-line.ca/fck_upload/file/kuwugasegalegomovonaxinew.pdf
    • http://birzebbugastpetersfc.com/files/file/1953342272.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/weluxisibaderumel.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/78098299027.pdf
    • http://aexpress.lv/index/images/up/file/nariresogafumixe.pdf
    • https://kede.org/userfiles/file/70020990944.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/46622222736.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/59250542833.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/depovemozaminotizeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=feasibility+study+deliverables
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edeb.bin
042a70b86fd67093f966cd8c17cc6481384e3a929cc5ef3c01042d3e150bc4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10412 bytes
font_01_sfnt_off000105a6.bin
c3b7649f83dca3601a051299be6b8757f9aa15d6f13080c3970aa18d92b374f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 16088 bytes
font_02_sfnt_off00012f36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 16792 bytes