Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66b15783308e88e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 04:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2dbc82fd21f52f804c29ded4993d8879 SHA-1: f97a2bbfe5a54957e23cd437af0ab7636c8635a0 SHA-256: c66b15783308e88e03a38d7c8d1d1c68ea111bc463bbd43bced77ef511c40bf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://edusfera.pl/upload/file/jufafuwewejuzidanusidedeb.pdf In PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/47616642354.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17806830065.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/93771780583.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff495ee57---5345514637.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/fexewul.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sejavisolesamo.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mebasilefoliwutozuva.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613862edcb6cd---31669531423.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/guwun.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/531a0f6086c123951bd9dd0b3883f514/rafilijuvidek.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tapebit.pdfIn PDF document text
    • https://fototipia.hu/files/files/34470621164.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/lufusokadekuru.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/fuxebazu.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/42425793587.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66205065751.pdfIn PDF document text
    • http://manenshop.com/upload/files/84656242686.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/simopufifijosodupeba.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/32171084186.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/lomogolepavevamalepenegos.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/gazakuz.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/4637479545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=boku+no+hero+season+5+episodesPDF 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_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 10724 bytes
SHA-256: f3b975167d8da922912dcb9c7d6257315415c3715a3230b61a64a94217f021a3
font_01_sfnt_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 16608 bytes
SHA-256: 2c8638c6f0665b61f968f1c0c004550edf4ea11424547ec3bfbf031851a18f71
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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