Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b6c138ea0a5ff5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48815ff6911d651788926dd0fab74205 SHA-1: 0edf381274b7375221992028aa2d82947f46c875 SHA-256: 81b6c138ea0a5ff5b52dbc13f8d0fe732879756c65f75b7bd0e08771659b9669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://lolakarimova.uz/ckfinder/userfiles/files/pufexemuxojikatagirirel.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b24357325751761bcf72619637aac974/senikopulidapesiwujizirav.pdf
    • https://ikansambel.com/contents/files/noseg.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/puviluledapujatososomunol.pdf
    • http://ppogrimall.com/upload/editor_image/file/vigadiguranajofutavuto.pdf
    • http://studiofranzoni.eu/userfiles/files/texevajijogujojarakenu.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394d26a43e---kamenevu.pdf
    • http://hzeiger.com/userfiles/file/65163072585.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/mubelepi.pdf
    • http://vanlysecurity.vn/vanly/album/files/72379754656.pdf
    • http://gostinica-domodedovo.ru/files/7856015264.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db05929f9f---tagizexuji.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71b7addd3---bopalisuravisodukuz.pdf
    • http://soleilboo.com/images/uploads/files/fujobujawu.pdf
    • https://nordavril.com/userfiles/file/51079511449.pdf
    • http://deltools.com/userfiles/file/sirutetupafo.pdf
    • http://perksys.com/userfiles/file/50154951431.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/vitep.pdf
    • http://85560891.com/upfolder/e/files/20210918163328.pdf
    • https://eletvital.hu/uploads/files/doxifupoxoles.pdf
    • http://murasakijr.com/uploads/files/6689652878.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=marvel+vs+capcom+infinite+for+android
    • 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_off0000def7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16792 bytes
font_01_sfnt_off0000f70e.bin
5a749a651c9c9b3027f69d464260099843732627e31817ed66f443991cdb5cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 10840 bytes
font_02_sfnt_off00011011.bin
0d5f9c6145db1bd546b5d2bbba31974bd2527429a0e67920e1137b6f5f304b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 18408 bytes

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