Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6ad447f442ad9f…

MALICIOUS

PDF

98.1 KB Created: 2021-09-02 19:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2f1619559a60d8897a395cf74c1cc2a SHA-1: 6ff64f60d3c70e3a7410bde37673e1dae6e3de24 SHA-256: 9b6ad447f442ad9f5e17a2042d57ce7f2a6d318a27ac32dea28a4c807bd27522
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple links on disposable hosting and the use of UTM parameters further support a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758fde98b1e---53962234052.pdf
    • http://dekobonner.de/userfiles/file/75119752466.pdf
    • https://bestrecycledautoparts.net/images_i/file/giwifepeb.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/21113063195.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/caad7d133281ad3794daaa03c788e1ca/mujetazawenalive.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b39de5840---20595532427.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rrl78ou9ef9fhodg3qtids82v1/24490978901.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ab49054919d929942ae34513c31d56b5/wizura.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/85ff4297ada022db7dedbbaa25bc7ca2/28251530305.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098395368bc0---99939983018.pdf
    • https://valve-toho.com/userfiles/file/malomoporilopawuzekejuj.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/de791721da2630daba27780d9b81da2c/70021391530.pdf
    • http://breakevenpoint.pl/uploads/editor/file/22565392606.pdf
    • http://hopkim.vn/upload/files/tuvaxevuzezafulesomipewa.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/db0ef6b6885d7903e23edf2c964f8bdd/17565648406.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/93faf64bdb2e7d57658bf31d7b76eea6/wafebowojagawesosapuzo.pdf
    • http://forglass.sk/userfiles/file/bomufaxotipusewiriru.pdf
    • http://wisdomtours.net/upload/file/70018189972.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6f2e8b8abd4aed8307bad44ee2565d68/mujexazijunugumu.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ef06d9c7d3e2720b2606cd5747aba76e/88904421852.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078dab667930---gowamedopawinomi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=inferring+target+audience+worksheet
    • 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_off00011479.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 16792 bytes
font_01_sfnt_off00012c90.bin
f3e7887e8aa61a4ff5ef753e0d3078856e1aca074a6c2ca9a931f77922a9da06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 10936 bytes
font_02_sfnt_off000145c1.bin
83e3870c5afd52e28397071c5cac266db287ae542635e2e2d503bc72a8b4b901
pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 20884 bytes