Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d86fbfd008299a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 12:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ece8fb6414618442d382a73024ef623 SHA-1: 17990c37826bfffe6143f18127bbbcb8d9669072 SHA-256: c1d86fbfd008299af1f10b4644cdd874781e4ece90451324b55cee22c0407304
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://vleek.com/uploads/files/naduw.pdf
    • http://studioesflores.pl/obrazy/file/degativawupudalixu.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c912a1cdf---tixufirewub.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dokemamezapolaluxawugogar.pdf
    • https://parlagame.com/calisma2/files/uploads/wukesa.pdf
    • http://serting.eu/userfiles/files/64322038728.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4lc6ghda9pgo1satmm394f5erc/93224380299.pdf
    • http://oa30us.com/userfiles/file/jetenibaporapirimoj.pdf
    • http://bagiez.de/userfiles/file/55010359045.pdf
    • https://rais.bg/uploads/file/tuvunigelodorukowifoma.pdf
    • http://lobi.md/userfiles/file/47800195350.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d26dab906---58265704564.pdf
    • https://matrixx.lu/images/virokufagizubemafixi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f5e7e963---70406480211.pdf
    • http://4x4autok.hu/userfiles/files/72188267771.pdf
    • https://adikkeempat.com/contents/files/rujezubuv.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q8dr7u5lg7r40fni189s7khnm0/xewiweweboragej.pdf
    • http://jr-bang.com/uploadfiles/20210911065259.pdf
    • http://oasis-inwaste.asia/files/file/57564949746.pdf
    • https://jjcfurnituremaker.com/userfiles/files/46484762677.pdf
    • http://allefrgycg.news-read.com/upload/files/93574046923.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/4225069523.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=zack+snyder+hbo+max
    • http://s250801404.onlinehome.fr/img/uploaded/file/13923310377.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_off0000d4d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 16792 bytes
font_01_sfnt_off0000ece9.bin
d6d294ccf394f4b37b5352639ff738482ba3e24863120f1bd016d2bf5e1f789d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 18644 bytes
font_02_sfnt_off00011da5.bin
0b7372ce8df1ec312f030cb88f57ae35e15650e01d5beb8145e69faa68e1d244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 10808 bytes

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