Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8c65ed0268fa4b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 04:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb1511d27edb6939f395cafd3b7bde01 SHA-1: da85f020cce32cbca386b7e5b099b9396c131fad SHA-256: 5d8c65ed0268fa4be03f29f87789e301c72ec4e58a011b7528a6f6aa58c33a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm rule indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=e+bravo+movie+app
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132af1f1521f---mufabekuzomoxezoxaberol.pdf
    • http://holland-ex.com/images/blog/file/53540348708.pdf
    • http://avrig35.ro/uploads/fck_editor/file/83070400798.pdf
    • http://hotelamadeustorino.com/userfiles/files/4380335364.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/fafimuna.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/90727954631.pdf
    • http://firegallery.ru/img/upload/78851952297.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/15596368969.pdf
    • http://www.derbysignandgraphics.com/uploads/file/27448287760.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/kowepexaxamiwanavulupeso.pdf
    • https://muacash.com/webroot/img/files/toxafux.pdf
    • http://antoniolescio.net/userfiles/files/wozifilonuseporixog.pdf
    • http://www.specemc.ru/upload/files/74071436296.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c37b2985e---49609317944.pdf
    • https://grafconsulting.pl/Upload/file/wajidejoj.pdf
    • https://contabil-fiscal.ro/mm/file/34181715256.pdf
    • http://thucancakoihikari.com/luutru/files/garavesozufalusobagixakam.pdf
    • http://terhautz.com/upload_files/files/fopugip.pdf
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/xifiwogekefumad.pdf
    • https://villamishkan.com/310renonew/front/images/files/84261946673.pdf
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/70302857560.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf21cdfa4---37935033052.pdf
    • http://araonline.hu/uploads/file/96641724636.pdf
    • http://abbeytraining.net/userfiles/file/gomor.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_off0000e829.bin
561a4d02085c69c99970df877c153eb3349626d3adca1cc78557d969f21ef75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 20716 bytes
font_01_sfnt_off00011ee8.bin
5aa80033e526684a81dc2863d29c7c81edd8d21eb30c0cac60108ed9eaf8d9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 10188 bytes
font_02_sfnt_off00013584.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 16792 bytes

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