Malicious PDF — malware analysis report

Static analysis result for SHA-256 15792364063b9df2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 04:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e25dfacd537d04e14fc123a8977cf09 SHA-1: d7a18d4ef87124851ba2861c60039e70b2bd42de SHA-256: 15792364063b9df26a51fe5d7cf1018f2acebfde6cab96d4c1069064bd6c6d80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://studiodrago.eu/userfiles/files/keluwo.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6aab1796---kejipikapaduvubot.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zifunudisazalorit.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/80351277442.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e97631fc---kozodopivogoderedikubezo.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/zorenekiza.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3dc61995---20289103979.pdfIn PDF document text
    • https://medtek.vn/storage/file/duteku.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/japonowevelenebevesudi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/963e4ddc060c88b0c9c69af7c4db0cf0/xefoduxexujotinuwixawax.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/57566813572.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/zivor.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/14950805418.pdfIn PDF document text
    • http://simonide.org/userfiles/file/25012896843.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160907f82703de---46178338460.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19949e618---pidikaso.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/sukepomo.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///75185427267.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/tokonotepedazabisabub.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/28338854930.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/14736102952.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/99835087074.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/zoxavitepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lonely+planet+chinese+phrasebook+pdfPDF 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_off0000bbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAE 11020 bytes
SHA-256: f8201b2f009c54ec1d1bf1c1cc6dc95d159717c5928a5d82df6e8e82fa69a8fe
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 19564 bytes
SHA-256: 4b5c73de54cb3c7321c11657debbf4ca6d2660b71dab6cd9be0c41e647059d3e
font_02_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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