Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01d2c5a8f5208d5…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 13:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c16294c337a1d1968d21ed7f31513f60 SHA-1: ddc0ec09b83b79bb305cb12e5aa8f39f32b2f9dd SHA-256: f01d2c5a8f5208d578ab999eb317481b946a59419859818a60c2d6215c8df88a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the heuristic rules suggest it is designed to lead users to potentially harmful content on disposable or compromised hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/12efce0155352e339456226421f54276/6415097186.pdf
    • http://urgentcarepb.net/userfiles/file/todijumareruxo.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d277c2717---73395332077.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1440b74f27cffcf01bd0ff05c0750c96/kovipusaluzu.pdf
    • http://luisacortesearchitetto.it/userfiles/files/towotuvotosajilini.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/97f984d9216572a4cadd0d94004b8460/kubojowawopibafubav.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2bccb3b8---95587302847.pdf
    • https://raiporjai.com/piceditor/file/9134332613.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7s8kdh0mevfnfgj8m2r535tvpn/nekovubituponumutiropij.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae4afef5e7cdb6fd0003670eba44bfbb/vitilabezokebalote.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1b57cf93---lumudugijalekimesimu.pdf
    • https://tecnibat.net/uploads/archivos/daliw.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e1drq79v3k9kusjgsjs3tdb877/45401572594.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=south+africa+continent
    • 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_off0000ece8.bin
5a7d2c57ba9d939ff63491c9cdae169dad70d903677f382267aefbdc36446a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 18020 bytes
font_01_sfnt_off00011be9.bin
38ba9f17ee083c3523cfb3b1c113b443fc839df620dec42fcdceeb8d587ec5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 10396 bytes
font_02_sfnt_off0001336b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 16792 bytes

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