Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b54c62ead5f0ed…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 11:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8c457feb2a3b4d14177fef8043ac239 SHA-1: 24cc84f063adc73e5481cfbe3b8c3c235830bf74 SHA-256: c4b54c62ead5f0edcdbf79955edaaa93858b6d9b080824858d7085109a801c0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious content, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=is+lead+a+nonmetal+metal+or+metalloid PDF link annotation
    • https://kermanrooz.com/img/files/12459478620.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f57f27a28---36289411619.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/24827889675.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/22813412888.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/tobaroniladex.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161369b3b2488c---zavupukagowe.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_235217.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/78317495648.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/97337288284.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/19371813632.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/86188989287.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/011706093510.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/8961990218.pdfIn PDF document text
    • http://precisao.org/files/files/wekef.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/netawowemopet.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/46335445675.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/sukaxumeb.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090417115482.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fewelipozifepawovef.pdfIn PDF document text
    • http://idcla.net/upload/files/96852442616.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/73724488845.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d00314b613---92918912617.pdfIn PDF document text
    • https://everestart.com/images/stories/file/walemipifipifugaxomijawil.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/mujudadakuzoka.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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 18236 bytes
SHA-256: cad37aad5f8b426786d4eda4f0242f66c0eca90bac6d1bfd9dc631f960581731
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10360 bytes
SHA-256: c18a8f0bc892f70d524a6292ee5fb849fd67dfd2e50e8b71cc95771da1fdfc2d
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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