Malicious PDF — malware analysis report

Static analysis result for SHA-256 83eb913d4db4e46f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 04:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70aa0b6c70c11cb6279fe000f9238a2a SHA-1: fe58801eb0fe7bd59ba840133c646baab435f132 SHA-256: 83eb913d4db4e46f5ce2e0646e53ca97aeeb8300305313e7d28416013353ae19
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm hosted on a compromised WordPress site, with multiple URLs pointing to potentially malicious content. The presence of these links suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133439f9541f---88879521004.pdf In PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/zusosiw.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42653854011.pdfIn PDF document text
    • http://partnercable.com/files/jisimufadoteles.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mapusu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/pogupapajuzim.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/60348346017.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/poligigojavaj.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/kifexiludufoxokodoj.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/29973451711.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/bunutobefod.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gilivogotix.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/17130872938.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/besiwove.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kulolurugo.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/36045701809.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee4114a52---vokotuzewakanezuvumosum.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/takusopulozewagasu.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/54129095877.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c077088e5---87054360945.pdfIn PDF document text
    • https://webrobogo.hu/kepek/wixerogunofidevorajirip.pdfIn PDF document text
    • https://matratva.in/userfiles/file/68395626623.pdfIn PDF document text
    • https://nada70.org/userfiles/file/fodal.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109011044123701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=scary+movies+torrent+magnetPDF 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_off0000b58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 16380 bytes
SHA-256: 6545c47ff40f4224011978caf323e857462e0542575756998b6acdfb1f934a84
font_02_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 10784 bytes
SHA-256: 12c9563d4046d1ac9f34925b02b9b0bc729118ae70fd333e4b04e0ad7b8681cf

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