Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c0df1701b0f66e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 09:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4a664359385430975fc881dce657880 SHA-1: 63fd25b60fd62ab07157e40da830aa7ca07819de SHA-256: 56c0df1701b0f66e6259822fd3ea4a12608d13603822142019175e233cb6cc53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs, many hosted on what appear to be compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://electric-kernbichler.at/59742382015.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5c2c3b6a---52518017299.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/35494520246.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149caf84d675---nubazolexugop.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/99338148750.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/12716919363.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/runutoj.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/buxosamojotoxawoxifetimul.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/50004122304.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/3477688344.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wijawizulububajadasomed.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/60980641962.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/danutuj.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jabizuxekesazes.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/91282087815.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/lapabuxasefaku.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/widom.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dogaxigaxurefipuja.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/321ac8a241409528a16ff32fc3cc7cc5/julovigaronelofibe.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/jirilanefifamodafa.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210922_AB3A296799CEC7BE.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/39315067623.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/wugapugisupogupefonilokel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+audio+visualizer+source+codePDF 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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 17832 bytes
SHA-256: 5a7949982f709ec5f0252c2f16a9edb4d2c55257797edf5bcd2d2c94fc0b5c71
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10472 bytes
SHA-256: 9c000bf69c58dbd3f5a59a8ef03121f509089b59cacfa077b34028edb8c8fc1c

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