Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bc4073d95fe9be…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 19:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaa53799b9918521d7b164aa3c2d07a2 SHA-1: 8323933167cf9a3383b1ef198560751feac87ac9 SHA-256: e9bc4073d95fe9be474eac384674d481f5e49ea0d3ddfeebdda3a8c211f43d93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca214cd22e---fovepukoxelum.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a415163b22ddb931af5186ab8137307c/45904258880.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/js48b2dab8835e00rnkstushb3/6742189982.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3a8b675f---81200474878.pdfIn PDF document text
    • http://axwelindia.com/uploads/vowasera.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rofaxatijevi.pdfIn PDF document text
    • http://boldogelet.hu/media/nakenoxenuvusedi.pdfIn PDF document text
    • https://akemi.ro/hirek/file/wudeg.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cffc89eacfb7d18b4b5bc74ef02174db/74430140227.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f5bd5f37c0570fd139cdfde2a892d6d/kejabepisibafaro.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/79813028985.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/domugoliturukoro.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kekavanesofefedavino.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/mazedamoraziz.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/71736729183.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd00a8764---rolased.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1d2b5e98072c6fd2e9bb18d70298bee0/60112211114.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fa2914c1b83f9a95e76f5c94ef03c08c/7520506549.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gomcdfb12299ri0oqihj3u8pg5/53387644180.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/86523708345.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/kajoxapopopejipenegoruru.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/pulanowaziwapejaluwa.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/muteda.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/delezi.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/71409051867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mohammedan+law+pdf+free+downloadPDF 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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 10484 bytes
SHA-256: f5bdc394ed6da0c3bf1a337fe312c041c0d78d7e75642684ee1737c6f838289e
font_01_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16464 bytes
SHA-256: c32f1c1df0dc52e85c8ff493e3774c8ac1f358dbce89673ba648415539c97d8a
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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