Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1931ec7433e3db…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 16:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 644ad21ab0e39146864198c8845d6282 SHA-1: 0dd2ffd8ea63f4c44eef119ade985dabb9100d7a SHA-256: df1931ec7433e3dbf9e77e43957baa721ac912ed1e2345d1bc18db3a77f7059b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external links, many hosted on compromised websites, suggesting it is part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download of a secondary payload, and the URLs point to resources that are part of a link farm designed to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://crewmak.ru/uplcv?utm_term=download+diablo+2+android PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/i8r4lnqp3kcq9n78v467jekts2/14736314613.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907002604287519.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa22c7ce1---72097953311.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/54749076841.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sunodixitojaf.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/89551045121.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/22490581931.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b32d17993---61255731860.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092814572048.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/dinutojanexixar.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8ae3f3476---22696930256.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/39013217797.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/meputugakiwaloniworuto.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/32522603041.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7b9dklesp5i7baamn46ul3gumh/naludezegeramebibo.pdfIn PDF document text
    • http://hongdacable.com/d/files/30762146599.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/36391110623.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/jekilub.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_1E72A192E93F057B.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezupiwediwapajofula.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mutejevipuwipuwali.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sibowokitir.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/20241397959.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/90078074303.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_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 14848 bytes
SHA-256: ae4613ba201971937d28bb9ddd03b1e6dbc993902cc3c999c97719c596f701ed
font_01_sfnt_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 10188 bytes
SHA-256: e764cdc13f2eb79b88b2dba7bd2c524985b9c1d829520d56c11931b779e666f0

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