Malicious PDF — malware analysis report

Static analysis result for SHA-256 54410950bd500d6a…

MALICIOUS

PDF

68.3 KB Created: 2021-10-03 17:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e1122e42dda1339165e4d5cfc0c13da6 SHA-1: b22e68873903f13d77765d0fa4416676c66bb673 SHA-256: 54410950bd500d6a5fbdddd457b37aa78fe9dd5f4122ea1773f750ea301b32f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including one identified as a compromised CMS upload storage, suggesting an attempt to lure users to malicious or compromised sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vector-food.pl/userfiles/file/nisurameduresexilotur.pdf In PDF document text
    • https://ibrahimkoc.com/images/Media/files/55600436294.pdfIn PDF document text
    • http://machin.kr/userData/board/file/66786791821.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/lugipa.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/zenaxenisidanariropuke.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m8ek9iljj2ereesqlhe1oumbm4/rovulowofedagaxemajuma.pdfIn PDF document text
    • http://philipsphotographystudio.com/46271963664.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/fbd8d2f1e66da092ddfa05cfdf426930/kipesegawomo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/43183729400.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150fead1aedc---24550966482.pdfIn PDF document text
    • http://planetamama.ru/files/file/42095296704.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/safumulibubavotiroju.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/21720434675.pdfIn PDF document text
    • http://prestopc.it/upload/file/pogometibad.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/galofibuzogizad.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8c97eaa7e08bca82b51999767f761ad6/61478380617.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zipukapudumafulim.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/xosonesisavupipulal.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/kuwuxanexumotivi.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/fipavixewuw.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mipuv.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/99888854978.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/33522745810.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/suvaverosiwu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/fujerowofuwiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=401k+roth+after+taxPDF 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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 10252 bytes
SHA-256: 130b1ee5fb5aabbc166215c4a68efea4ec0c38f9cf12fbce6fd2bf1bd892f98e
font_01_sfnt_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 14336 bytes
SHA-256: 3e03b8cee6650cf5a9f5c80d5fb38c6ca9bf91b8b798e9eaf7f507ef2eda344d
font_02_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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