Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a20c3f84079e45…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 02:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb7b8bbe5a455e490a9898432fad0206 SHA-1: 637580b9b2a48521d912a4ec9de2e106576fdbd5 SHA-256: 22a20c3f84079e458f5209749b3b206f0286b30a6e0adf714f4d675e8205d43a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

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://infrive.ru/uplcv?utm_term=watch+hannah+and+her+sisters+online+free
    • http://studioschicchi.eu/userfiles/files/55589472224.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130029a8d4ba---jugetinapobozixifimabel.pdf
    • http://joy05.com/_UploadFile/Images/file/94013774268.pdf
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/65057417662.pdf
    • https://poolpoint.be/uploads/file/89335164921.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0mne3v2ueba2d32spm4urs5l81/nedofisefevikorejerazabux.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/45383796743.pdf
    • https://begili.com/uploads/image/files/96896589307.pdf
    • https://eastoncn.housemember.com/uploads/files/wenex.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiselipijesixu.pdf
    • http://szyoujin.com/UploadFile/file/20210907160759931.pdf
    • http://qazaqbanki.kz/data/content/files/favasakuziwu.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/wirip.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q9rqrpt3pqnibhha7d989bva2j/91623345337.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/59825284725.pdf
    • https://eventaipei.com/upload/files/dunewibefab.pdf
    • http://pn-tech.net/userData/board/file/jowuxedejononizoroxariw.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/af29d92b1d15980fd628cca165d66d55/damamulekolepugidowom.pdf
    • https://festacontinua.it/public/file/wifejanupu.pdf
    • http://sobateracota.ro/mm/file/fafeguv.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/naxub.pdf
    • http://rasmesafar.net/basefile/basefiles/44374228195.pdf
    • http://aimic.com/userfiles/file/gebasone.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/rojuxalurorowikidalirumag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d740.bin
c206766c7ccee87555cb80e226cfca1be7ed0d0e7cb7bda09f5344269be2f3ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 10568 bytes
font_01_sfnt_off0000ef52.bin
f94bfbde02f51e1a8e1e682ee6068e9e5ad0251a26cc050d016cf4f6a6a00067
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 17844 bytes
font_02_sfnt_off00011d6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16792 bytes