Malicious PDF — malware analysis report

Static analysis result for SHA-256 578bcd964f8816aa…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 10:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a58bbfa373dd671aa7240b5a1cea7552 SHA-1: 5e24223632f58bcb91ea6bd641a61b6d1ffcde65 SHA-256: 578bcd964f8816aa080f6248192b0f92471bf47d9ed6a24665254140b22a2e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious files or redirect users. The presence of a 'link farm' heuristic further supports the idea that the document's primary purpose is to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://shreenatharcade.com/userfiles/file/pikuvuguka.pdf In PDF document text
    • https://techielingo.com/fck_uploads/files/difirinazuxosowu.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/57987483168.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/72424631533.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/30115298703.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/miwipixuwatasidumaj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613407327f80d---17248274901.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tjisnf9bjl2smt61q7vctu3h30/24154566238.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/55374011955.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/naxusejesizekig.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9659ebd20fe67987711f986508152142.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303a47e8d1e---95562901680.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906195624_72ux93.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/masupar.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/48807424620.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/98423456181.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/61292594246.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/26778318862.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/9909550839.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/jukegusidixoropo.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/86111119532.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/21182527471.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/xaxomanosonuverew.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/dajasosusasewezilipopoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spotify+premium+cracked+version+android+apkPDF 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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 11184 bytes
SHA-256: 17850f6093796f3d0292360d387817e71195136b7d0b20611771aa9adefc5653
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 17712 bytes
SHA-256: 6980e360563f0638d58b01c5b404275801a9458d94351065378cae6d5baa1039
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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