Malicious PDF — malware analysis report

Static analysis result for SHA-256 556cad4c7c4e1743…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 16:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ff3e52bc9ff46a4a73ed3fce8c1d1ea SHA-1: b978102e4f0e39057cb2ca03c14556d3ce35fbba SHA-256: 556cad4c7c4e17436d369ff3366ddbb518c940393c00708e10b9e95c9ed71f8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many of which appear to be hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=how+long+can+chicken+last+in+the+fridge PDF link annotation
    • http://shangrilatheshow.com/ckfinder/userfiles/files/xebofema.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/20866174244.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/lolapetovez.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/93782453854.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97328676151.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/64024305655.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/pobalu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/27119743588.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/64341027767.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/lidezutolo.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/58120931897.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/14207125239.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/98033145295.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e0qhrneic05c203bqo8m34ddua/40409183446.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vuvizabokotetaboredomiwim.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/golaboreximadasa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7373d4ce0---vefuwepegiwurulebojavagot.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/94789639690.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/51167389754.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/39569098774.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614018e75451c---59828392630.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/puwajanotalububuwufawenor.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/vufuxugusad.pdfIn PDF document text
    • 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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 10924 bytes
SHA-256: 1ea08c9f4218c61d9598de23da80a0f333a3ac98a19f9c0e0f5f945cdc5c8737
font_01_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 17060 bytes
SHA-256: 614b98c526f8767b63020f82cf8b5b6ba29c9b455822172f97df9a0d3fc48dde

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