Malicious PDF — malware analysis report

Static analysis result for SHA-256 8619180354cd1f50…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 14:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 058ac7eb0a71306c49ebcfe6cb9836a8 SHA-1: f18b3ed7a8157ee9180209c577e31f1f47ec8262 SHA-256: 8619180354cd1f50daf271f099212345c520e10aa1b934bf9a93fc4cc24d48fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised CMS uploads and disposable domains, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://giriconsultancy.com/content_files/files/19722146979.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da937dc2f---migawogivajusebul.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25506559867.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/70099178573.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/dapil.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508124739393120.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210608/1314047857.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/87690291541.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ee04281ef---89001358503.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/79450975606.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/gixagosurukisibe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc1118d668ac2b34c8df4ace352ee8fe/josaxoraje.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/3950260088.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/45975013947.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbad1aecae2---besedekixoratiluz.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ad37a8b67---valavizerumotogoj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f92e03de---44505144285.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/be8d91b2a5c7085287e641a9f6672ab3/35820644539.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ie7ot5v5g1g2v4bf7db0maq446/65565025967.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/68335612765.pdfIn PDF document text
    • http://abpaluso.com/upload/file/19092681166.pdfIn PDF document text
    • http://jarosi.hu/files/file/58847464586.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/xexufusivetata.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gnp1a9utq04teil35svcl8pl36/36049272629.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/fefokeloduvekagi.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/31816853468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=classical+mechanics+taylor+2005+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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 18080 bytes
SHA-256: 851462bedb55c9dc832013d6af7de89e038fd433358a395713ea1698c3109491
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 11408 bytes
SHA-256: 42f3c6b974cfa898ba9c60eb248d8d69ce7d1f44cf7a91d5c036216236e9d436
font_02_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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