Malicious PDF — malware analysis report

Static analysis result for SHA-256 206af4cf3490c9bf…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 15:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dd444c282de72fb3956d356443f7d1f4 SHA-1: b601dc5ae4482193b64be0119c6c30bb47fe819e SHA-256: 206af4cf3490c9bf02237d04d6af87521f1cb528dccd508ad5fc6f8aa5cb9c51
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bestpokeya.com/uploads/files/34244740054.pdf In PDF document text
    • https://joinvita.com/neu/userfiles/file/kidor.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/buwetusowubo.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/66058485927.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/83372073311.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/13066298304.pdfIn PDF document text
    • https://izometal.net/mm/file/12947927931.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e6a563338c1056903e2de4a0ca2a9abb/37219997438.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/12664762185.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_7C1D1515413EA239.pdfIn PDF document text
    • http://ailizia.com/userfiles/76650074979.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/20780046453.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4c1e13f4---mibetatapuvupuwomovu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210920141914_1115970525.pdfIn PDF document text
    • https://linker.tw/files/24585592780.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/31666167956.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210921104848.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/48870522913.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/dc11b2d9c4441c9f2e7ef89d505c45a5/pazugofutiju.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/zuwosiwadafozetedani.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/susib.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/20986008230.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/94839747516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=football+games+for+android+4.0+free+downloadPDF 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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 11164 bytes
SHA-256: 1f9c4da2b6ff8ce9af0b0ee28e155eef1117b578f9dedd872c63c75da8bf4bec
font_02_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 14848 bytes
SHA-256: 78a99ec61e9202c77a5816114364be8e4640d460e7f72d00c6b7f88b4a969de8