Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf306ca1645e626…

MALICIOUS

PDF

74.2 KB Created: 2021-09-26 17:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b6e737b108c9cfa9e5934946bdf52ab SHA-1: 5bd860e4f7a35217dffd693cac3db56ccef3cb05 SHA-256: 0cf306ca1645e6263b03ae0b065ab0036cd41655061279add5ed2d87a094c965
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://crysiq.ru/uplcv?utm_term=shadow+fight+2+52+max+level+mod+apk+download PDF link annotation
    • https://getracemirates.com/userfiles/files/96195529503.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131038346809---48650763138.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/fepaludedabuj.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/bipafidogupolu.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xoririnexirewafovele.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/femoj.pdfIn PDF document text
    • http://jarosi.hu/files/file/60969559920.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/68218248696.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210921_101834.pdfIn PDF document text
    • http://mopron.ru/upload/files/xefopamizunukabovozixe.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/26323720858.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/9000269698.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/41460452816.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614938b3103f3---31997898212.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/robetuxogusolazepadod.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141b437a34ba---paxosivunitukegibapipof.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210905012813.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a1ff448d93f2c856302e68b703b117cf/moxojuzekupapeludixa.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/96167287658.pdfIn PDF document text
    • http://ping-property.com/user_img/files/palulolenemufasakefeguda.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/rubotojojobefa.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917175813.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/wepelupexusozo.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/punanadizo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149a1ef45358---nekirakotalasefivoxibeke.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c9d53c6d0a471168a54a1ceead0d198a/vasakasadenoxiwulobivulo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/luzotasomatadok.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_off0000b9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AF 11352 bytes
SHA-256: 69f23a3f9d5a40353451abe13a8adf3aba9d519c4309253a266178fda732ec1a
font_01_sfnt_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 17884 bytes
SHA-256: 7457f69d8be02607e6ddeab1df5ee694cc932e7906dada21eaf529c89a1e9b10
font_02_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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