Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b63a3facf0c0e0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 19:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bec468ea3c578acd2823004345514f3a SHA-1: aac59395fd5786211b91af820f0e79ba7f31880e SHA-256: b6b63a3facf0c0e0187e48b5126f07832b385f7707d2d095cdf612ed76de73d0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is used to redirect users to malicious sites. The PDF structure and the presence of multiple links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://chcial.ru/uplcv?utm_term=aplikasi+edit+video+grid+iphone PDF link annotation
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/tolozoganamipajevabad.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5b671efe080d79ad00928cee9070aa3e/43325865451.pdfIn PDF document text
    • http://woykoff.hu/upload/file/67770844461.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/panidif.pdfIn PDF document text
    • https://oasis-travel.ro/files/48337978173.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/godalotutunipivejup.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/88920190573.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f43dc8277---32472162650.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jalizoruxu.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/21874926470.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/10509775789.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/53089831073.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/3326230991.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/22246136668.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/80335461167.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/63552890251.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xemizanededemal.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/lijiduximireb.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/sukovosapizofiruja.pdfIn PDF document text
    • http://risme.vn/files/23668785002.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58a97197dd42f478b3c7aff972c6eada/45240886836.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/zapatalobonolasonokan.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/86960335297.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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10812 bytes
SHA-256: 0c99ea0b21dbeeb93119bc398244aee749b7617ca619f499c009bc69e177352f
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 18808 bytes
SHA-256: b85563f646bbddb4d5f87fc2ed480f8b8ba8300ce91fe4f4b0ec6402c3b17fe7
font_02_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1