Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5e12dffd2fbf79…

MALICIOUS

PDF

72.1 KB Created: 2021-10-03 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 190bd91e9c56429a159a2e6b2cd6031d SHA-1: 3cc75a761fd4b8b9edd8123cb332444d1457bbfa SHA-256: cf5e12dffd2fbf79c7c40e1745238d7fd2836497884d828e25820e94b35654c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirect links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://mascotdd.com/file_media/file_image/file/6988314571.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/38529167536.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zigedunexepuxemusaso.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zasipuromegijisugudex.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531e90ca3---5569033875.pdfIn PDF document text
    • http://cichanski.com/Upload/file/lirononiz.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55588976282.pdfIn PDF document text
    • http://wdnederland.nl/file/26798864432.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021917345354793.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/16002473386.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/86747735277.pdfIn PDF document text
    • https://magerp.org/upload/files/23170712018.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34687496696.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/22430486279.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210918200204_5zv31l.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/26951513805.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210926010100.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/416738bcc266c29e39f82ee1735d17bc/91222197788.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/92090909785.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/vaxadu.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/povuw.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/69102578316.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f21798ce86---nifewipigul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=read+the+model+text+and+listen+answer+the+questions+in+your+notebookPDF 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_off0000b4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E4 16892 bytes
SHA-256: 6f40a6d885303ad5d33379d5a6fcc0386016a16b1a64e222c5c4fbc20f906eed
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 11340 bytes
SHA-256: 8b3f98949c2f3093bfe0003eabe0e10d615dce75eeac9490cdbe45d373c5610a

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