Malicious PDF — malware analysis report

Static analysis result for SHA-256 f580353886e65893…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 05:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa52e110ff5c2c2c2deeaf6ef4ec8133 SHA-1: 590a78356aa7ed4e3cc4c17942ec51cb629d1015 SHA-256: f580353886e6589398d5a78d09d677db9db94fa6281894f06e0d8eeb9a54b5a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=3dlut+mobile+pro+mod+apk+download PDF link annotation
    • https://cncunse.com/d/files/pivitonutinojizuzu.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zajovewig.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161312101d28d1---savelajonu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wibix.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/68091050729.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109131004169555.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/tewofomatibopa.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/befomufujifubibazibizowuk.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/gigivutikibovowiz.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/90546625910.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210910185340.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/luzivukenegitijugaw.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/54990777142.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/semegu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/wukugofarujulipifefi.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/6654975351.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/vudud.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zubipusatovobudezajudob.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9994ec9c1---69355794368.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/gogudifikonox.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5572f79e9e245022730d57c0c5515ea4/votedibufopu.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/68227227222.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/nuxekekalinuromaxutu.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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 16796 bytes
SHA-256: ec41dc63f2fa5317c974615f6a4e81bf9488eb6240eec006c20249c8b244753a
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10880 bytes
SHA-256: 450b47c1a5f6a0acad5300994a62db7d68c1de302eb7f1f7bde0253c0be12b9c

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