Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3eb107706bf4de5…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 01:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41bfbedfac8bff061eda463b3c2cd8bc SHA-1: af41fd02a08069a5203016bc15fc85cd98e459c4 SHA-256: d3eb107706bf4de51d55859b3b6ff3bc5ead7dc25310d44d1a2af981e6be08f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious content. The presence of numerous unknown URLs indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3b81f8be---nofolizamukarubobewupi.pdf In PDF document text
    • http://fleshlight-tw.com/userfiles/file/sorev.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b67207f3930---wesavezazalap.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/xunaxevonozitutemaxup.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/2408215771.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5b5b9562f57548ed4ced2e78d9542753/zelejis.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d92eb537887b8ebed37622d948880d91/morawugu.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/19778118649.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/podanasi.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/93944696267.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/97840698936.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/00a81323a369d6d4126bccf4aed5c323/xisawejigu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/liladono.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/78428792451.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/sevopesasopekoroxawutese.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/52c7f444ccbc3a25f241fcb97af3a600/31404414582.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dlp5iciq8mh92651h1bojsg2m5/64156018568.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610beb916eaa9---simexuba.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/58508281524.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a64cd9f7---bowinaxokixekeluv.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/dalexobi.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/xukekam.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/loxogozunimowexiwim.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/kejokesateruwelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hay+festival+programme+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10908 bytes
SHA-256: 7f8e4c743d8451fab791c1b345eb6dab6b793b658b20a66d5ba28078d26f0780
font_01_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 19200 bytes
SHA-256: 90c3689c4d6417ccf91a308225f485d0bc65d68dfccf8c838109c267421d6ddc

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