Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84eea4b046e35ac…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 06:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7ca9a381268f9fea95eb0c61cea7a41 SHA-1: 743cc0e5b3a69b36611821f2fc4b7a956c1847cf SHA-256: c84eea4b046e35acde62dec5dc0470f2c4623792ba89e2d26d69a7360e147a9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=le+monde+diplomatique+android
    • https://sfeerweter.nl/userfiles/files/tokoderedamudasa.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/musuborulolalax.pdf
    • http://jongauger.com/ckfinder/userfiles/files/vabewonameduj.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/faviv.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1e4ea3b8---kebomiwox.pdf
    • http://rld-carbon.com/file/1059466047.pdf
    • https://incoyun.com/calisma2/files/uploads/20689839759.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c27c863b8---mizutuninusipiriwitiv.pdf
    • http://selfmadefilms.nl/userfiles/files/66265574841.pdf
    • https://grup-rul.ro/printuri-fi/files/78160478600.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/pebilu.pdf
    • http://oecschool.com/userfiles/file/sodusuxare.pdf
    • http://www.iece.in/userfiles/file/12099661439.pdf
    • http://ownlines.com/upfiles/file/nilixojerukokufimefaduxe.pdf
    • http://taaltoetsvo.nl/userfiles/file/75369098568.pdf
    • http://uelzecht.lu/userfiles/files/85493830186.pdf
    • http://all-vehicle.net/js/upload/files/sidijovugugotunudabokutej.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/kuwimaxiziva.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a08c5133---10912133203.pdf
    • http://orderbestwings.com/uploads/files/majogenan.pdf
    • http://mmbc.cz/_data/user_files/file/37481948589.pdf
    • http://waypl.pl/upload/File/kozukidomajexixanufosedux.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614635e6de090---lozefisavizij.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0888c4595a11d8a01982f868d1e29ea3/48426004859.pdf
    • http://vuason.vn/upload/files/resivajeb.pdf
    • 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_off0000ea67.bin
a162d33b051a665e21167f2886c28a03eb14e1d1e54354691ca4d1f2f0a38aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 21084 bytes
font_01_sfnt_off00011ff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
font_02_sfnt_off00013808.bin
000880708377823c91ff9e0837fc79ed5f5ec9e9e95b8a52073d91be0a4f5d2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 10588 bytes