Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c402f80f4dbf99…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 12:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bad2ee7a74a3d2ad7403b49b782877e5 SHA-1: 1d82e93f4c8e147715b8abfcfe2319f57344a5ff SHA-256: 83c402f80f4dbf9940a9aa39f972720f63171f8ca2c22405dc44f5c44fc11f00
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure, suggesting a phishing or malware distribution lure. The presence of external URIs and a link farm heuristic strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://physio-praxismitte.de/userfiles/gemeturubesarebodivar.pdf In PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/61831724564.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c967027ccd---betasuwupabezu.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/zovesujokalidiled.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/41961972256.pdfIn PDF document text
    • https://gameclub.by/uploads/files/votudukuxitusej.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/wotetopumugogawepuzuruvob.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/regivuwakuduweb.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/85534943539.pdfIn PDF document text
    • http://ministerium.pt/files/wisefulasapegegero.pdfIn PDF document text
    • https://jobtiara.com/files/files/duzufamulo.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/jukafuduborarogize.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/51295932064.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b27b36f12b1594805b52906c482ded47/39253017574.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/88577354340.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145469f35d02---valuraxaxizasogubosasexo.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/wotazakamaruwifipijajeno.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398be8a9196---pokipu.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/11631912581.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lenilofoxonitebom.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/jupabosatar.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/jujudologunovurorir.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613801de8b304---27041087853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=offline+pages+chrome+androidPDF 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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 18504 bytes
SHA-256: abdc36d83da821dc6c8c262b02257541ee0ad0cd8773a633f2972bf18cdf1040
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 10996 bytes
SHA-256: 7f6e3a8cdf344683fda8063987cbc7b09c286894c868af983b97966f1016faf6

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