Malicious PDF — malware analysis report

Static analysis result for SHA-256 e890702af3a307f8…

MALICIOUS

PDF

67.9 KB Created: 2021-09-30 19:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96949f5efb5ea53eb939329858ae9ad8 SHA-1: 128ac5003bd8583b966571378071ddb137c99093 SHA-256: e890702af3a307f821dd17e99f7a4aa6d9b5bbee5c5f043e8b0075187c2b5519
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, including those pointing to compromised CMS uploads and disposable hosting, strongly suggests a malicious intent. The ClamAV detection and ML classifier further confirm this, indicating the PDF is likely a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=dictionary+letter+m PDF link annotation
    • https://carsen.sk/editor_uploads/system/files/rafirefosukurawitobanev.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/84457891097.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfcb276a9d---wukeropobozi.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/dufumomexu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3d63012d---93332935294.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/786227520f03394466e073b6239c6ad4/52982463247.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/69807105071.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/6122278529.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/siwajexajixepugariri.pdfIn PDF document text
    • http://entrackintl.com/uploads/7749382634.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/warixulelifudikesav.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/wemejevosogumapelat.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/sepobafokil.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/9016810349.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/92347896713.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/16068593237.pdfIn PDF document text
    • http://epicridesnepal.com/files/xafelalanelitakom.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/pulibe.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/muwofup.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/muvasamugilumukazusaj.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/79423465762.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630988607.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kifomofekomuviv.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/fowixuwa.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_off0000ae92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE92 10340 bytes
SHA-256: 160fb3fdf3903dfc3aae7b29f0f03416d39c614112065f3339d3e676d830ecf2
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 14456 bytes
SHA-256: 3925b62f1370bd5fe8daeb58dcf3614b8644bc87ac4f900e224f58f565e262ca
font_02_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1