Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35c839bf369eedb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 18:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 639d57c8d4ba44ca2c0d63cb1a581f85 SHA-1: e5460c7123d303d2e72b34e01c859722ca4e8614 SHA-256: a35c839bf369eedb649fc7673a3f0726be3dcb97853651b00f0ae8c5636cb3ba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=tv+series+on+android PDF link annotation
    • https://ckmusicdesign.nl/userfiles/file/puxavemetedix.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/xarubifaj.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/13223820471.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/71112782524.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vajonudosorolape.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7877a9e6113aaf48108e9d2b1ea88aa7/15704494051.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/37620934763.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/91086556657.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/74466378742.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/16211088423.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/25933293413.pdfIn PDF document text
    • http://henca.com/files/details/file/todapibupew.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/nibedosuput.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/88003922243.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/31150515685.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613995e54304a---sigoligikolokujinab.pdfPDF link annotation
    • http://iknow.pl/files/file/41345402065.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/41626486090.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/60144160659.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d7156da5---daxupafenevij.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d0323005---luvowarufajawi.pdfIn PDF document text
    • 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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 10128 bytes
SHA-256: 42a0c7ef92233f1c565bc98927c4cad0c32c60a57e77e5187f14920f350543ba
font_01_sfnt_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16252 bytes
SHA-256: 7e5ef34cb55ae1a03c8db7fb3c84391adc8d8579c4c870dd34918d8ece55d57b
font_02_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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