Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a2b07a5de8cbf0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44d1ff3bcaa5d19d75e38a46b28083ee SHA-1: dd32e6b51144730c7413825005224f6dbacd488a SHA-256: 20a2b07a5de8cbf054d66983459aa35688cd37dc1d237be504256a73ab485f5b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://zifu-tech.com/app/webroot/userfiles/files/lawepikitimofalix.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddae54b0e---51912436428.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/25940205257.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa6e832348---fexoturukifumi.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/96667059086.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xiwug.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vuratimezuxe.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/7081490125.pdfIn PDF document text
    • http://learningkey.org/userfiles/99705734582.pdfIn PDF document text
    • https://koratspring.com/upload/file/dovezutadu.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/76804597756.pdfIn PDF document text
    • http://qzgj.cn/upload/file/begoroletefu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5027756cae98ba8f122f2cdd737ab5f4/21100787739.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/96901375998.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d27e60c70e2e6bd525391548dd431955/rokanukukifubupelatuvovul.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/xepagovotorabavasureguv.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/tovazetafofomilavoniz.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/moletu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/92e29d0c7898bc174a23edb580b7a5ff/20906551435.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/11588334875.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/95356057654.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/jizefutataxegoxivenet.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/22471587414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=majalah+tempo+mei+2019+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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 18300 bytes
SHA-256: 495a0f95e27e18d3beb6de7b19ad824088cf0737fe913fa68a6b9ccbdf91a245
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 10976 bytes
SHA-256: 26a68f164455cd9b000bf70f4b37ad5ab38b420c750962706d1477886b941346

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