Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cd6d4c46c2544c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 19:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bdf87dcc0d499f1b68b0c4389291511 SHA-1: 2c3ead4d743da48cc6b6dd495c57b94b16b54768 SHA-256: c9cd6d4c46c2544c451e04feac7ec13d418b39eae5ea51a7cb6ed438184cf31d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to exploit users through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ahcxdq.com/uploads/file/301928135045.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4e431a0f9b684c83aa695b420c2b9df1/jewifuxu.pdfIn PDF document text
    • https://schmitz.cz/res/file/vurewukugotusa.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/065ace02f25a9fcc1fa12b949c53a9d8/revez.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081829d06a0b---5055516171.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c546189a---gixunaju.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/25/file/20210625_223239_156.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/44281336445.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/16114244619.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/wuguve.pdfIn PDF document text
    • http://asustainable.com/global/file/wedizifoxuxisemi.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/rogupefiparufijujunudega.pdfIn PDF document text
    • http://prestopc.it/upload/file/pozozaranodolomubenim.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/72605238099.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/84980963895.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/xipukuvubuze.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/992a92e3e78b506be44d2a62a8794442/36123525480.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/55863645726.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c692a6a671---kodarumaviboduvi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pepumopogusolujawavow.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610457d99dcc3---dagon.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a2bf0a2c5e37022f09c4cdc06a45804e/madilufovufusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=divertimentos+matematicos+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/jabolimujazekudibo.pdfIn PDF document text
    • 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_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 16996 bytes
SHA-256: d5c11c0653ec8f927aea4a4845c548edb2952ee5e99733017f4e4518b38faf75
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10800 bytes
SHA-256: 85b41a905d4e89c81e99e58fb22439d349738d03c36b21aae80ddb130bfbdc34
font_02_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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