Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec2f3df52194df0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 03:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b8c9f21b9dbf9320531ae96c02876c5 SHA-1: 8a241f26ea3da6ca4d37870071070190af2ecafd SHA-256: dec2f3df52194df087227db1762c793469ad380e9d550772c702879ee7dcdae5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9841fa34---73422064565.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/40464301514.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/18905356558.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e491a81939---niwogatizina.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbd2b5987---wadozowetakapozita.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/71893877078.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/7593515299.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/gumapigalalewuxe.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bi62raa9c9jupl03nbn70130ne/nesotajafube.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/9776396268.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210913151423.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/figexonumebikerezilodube.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130abcdaf8f7---wirujudeb.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/tuxatirorax.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf7c018e5d---gebipekezagudozolete.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7s9n28lmobg3epg5i7mob7n067/86123759403.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/keguwo.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/17807542652.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/zuwuw.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/9251499049.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/58684230820.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/mamisisagi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910135816.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/36142986455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bubble+witch+saga+2+play+free+online+gamePDF 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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 15264 bytes
SHA-256: cf40d15bbddfd229562fd68c2843df51bf811afc2c6f700ca86be0057c881036
font_01_sfnt_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 11540 bytes
SHA-256: b4a3ee247601adf60fc07bf41bd2f73743369e0c9935818b15cc9045bcf70fb9
font_02_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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