Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cfd4fcf7314ca5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 00:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83fc61d5e7a81cbf9841f9e1956875b6 SHA-1: 9ba2fcb1dbb84508cb242846ecf9d06c4de1977a SHA-256: 94cfd4fcf7314ca5ce7b4966fb28dc959db5233e76769adc7ed8fd919d85ece1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://synerhu.ru/uplcv?utm_term=5+iron+degree PDF link annotation
    • http://kfbma.org/files/fck/file/53741226120.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/26160552587.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/161fe657d4c4865154918c385c1ad54b/90419473365.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/28860850250.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/kusor.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lolalimopomuxeposota.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/jikiwakoganakafasalajuge.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/vasewezoxajirutegelevu.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/88299791760.pdfIn PDF document text
    • http://gr-chem.com/upload/files/97805718826.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d39cc1c942c755da2b870a30ffaa3f8d/32473253602.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/17919223596.pdfIn PDF document text
    • http://mp-journal.com/media/file/1607159113.pdfIn PDF document text
    • http://ossokahve.com/upload/file/watuxogufujepubovivuvenib.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea8d2a92c---87912790080.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/19012529371.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divovu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/zesitefonetoliwironufi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/poxazapuka.pdfIn PDF document text
    • https://85097781.com/upload/files/68056075910.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/sabanilimuwaxifuwaxupu.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/25869017933.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/12691260526.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kabifefatibowutajini.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/puvuki.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/88994919035.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_off0000bd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 17240 bytes
SHA-256: 29c1953a599d4529918dbd436ee9cfb40940317b0f4089f24f6fa223582dbf3e
font_01_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 9988 bytes
SHA-256: 4292d54c5a1f3d879a388689ee2bc47381528f249a9262c83e881c3dae21b561
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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