Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa88bf5924ae510…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 04:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86fb3853f7efd5141e9c89eda6f9d577 SHA-1: 29b95e5fc2527d8d313cc7a7f415a076b401ed30 SHA-256: 9aa88bf5924ae510380a199ce156b6595fcc90cf288bdbf51bed7e99839a356f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The presence of a link farm on potentially compromised infrastructure supports the classification as a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://phuocthuan.vn/images/pic/file/futafefagiromuvodedonusoj.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/46f81a138dc2ee0cef0c7c022329ab36/10522090852.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/76276821772.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/28237329170.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095520a5ecdd---79430754262.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d77c5d30---14747380390.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d0b070f0b60f0123be3ec1ca1473f04b/61006113249.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/39058762340.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/36048173287.pdfIn PDF document text
    • https://siroyensao.com/upload/files/95812698212.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/tuwilosepolasosaxukibulo.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210728_CA707807A0513C1C.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/h9amon5jt1ru89jjvdsbtmldkm/69320210086.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691e2c98e3---10950802742.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb66cdd6f---21247557920.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/82334906112.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jepurogudevixumewi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/42752908713.pdfIn PDF document text
    • http://geodez.com/pliki/file/borugetipulugupu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/81093417429.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/64951793631.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/fasivobij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adenocarcinoma+right+lung+icd+10PDF 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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10904 bytes
SHA-256: b0e9d46596a5159ac7b3007276abb66b7325faa8ab97d8786c94d72a34431a6a
font_02_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16416 bytes
SHA-256: 5dc4fbf7afdb1d315d7f29d5a17aa11a13007b491f0a690b11c93005fcc857e9

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