Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a84727934dadd9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-22 14:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 838094bdc28e124ae5396900658a0349 SHA-1: 4899432c4a8ac951265c46fc694a8a88ffe17cf2 SHA-256: d1a84727934dadd9bb44d1a9748fc1b422defeb8c79832c6fb53387177d13cbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=manage+apps+running+background+android PDF link annotation
    • http://gadkowski.pl/repository/filemanager/file/dipito.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/bosesigidunegofabewa.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kafanijejiza.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/totaduzexav.pdfIn PDF document text
    • http://goref.ru/files/file/46082446397.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/pofumavibojizumimafezu.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/39947112900.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/61088486249.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/rikepovawuzoka.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cc20a991---96884388991.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/nomapilagexuba.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/28255610102.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451667edb12---naporevifurelodulusoderor.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/62211522298.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/20107251986.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/buxazojusekevokem.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/lurekobevaseguk.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/jobivipus.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/66982956554.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/26826092871.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/wotosurijagoxinedu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0d075c77---sozotovusatanofosedulu.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630860211.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/tifevufutemaboke.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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10868 bytes
SHA-256: d037f63900dbaac1b7f8747a6f989871994c709c7d77b0f2876409c50388ac75
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 18276 bytes
SHA-256: 5e67fd9e4847f2a455b03e7db175e312729178c41b109079d27a6cc95bbd24e8

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