Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e526db68e41e75…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 20:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93bb20dee4f3318d9a04b1e121ce194f SHA-1: f91a4cca923313b74ca47f994300cf363c8c42f0 SHA-256: a4e526db68e41e7536b519221190ed6dff47e8e35d0e56324738ece55a26b8ce
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. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs likely serve as lures to external malicious content.

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 https://crewmak.ru/uplcv?utm_term=sumptuous+meaning+in+tagalog PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d24db09641---18473098937.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/viludamuneravavizizobup.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/1816108634.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/63893432961.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/1bab04df6f7bb8afeba6c214df1df96f/tomukujetakum.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rtcec8fk3ihucb2v52vack7nqj/sepal.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/kevumed.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ecd58f128---dusotenilofuvas.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/77056337964.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16123b3b32f9df---bugowa.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/96016770431.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210820_072927.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210716142058_892963586.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mubemiza.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/22229492248.pdfIn PDF document text
    • http://chinalabware.net/d/files/fokadoxuguwamegiwikogim.pdfIn PDF document text
    • http://winso.tw/userfiles/file/54901640234.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/40553078393.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210717_C465876C0193C419.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ba2a6dc122fb44cc7dd01ce571d69169/rumawivu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xufip.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/deruzufupegig.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/91181346044.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085195f8e28d---31208073586.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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 17012 bytes
SHA-256: 766299d4a7a74940549108a73ccc59723d6745298f5f0e4c5cf636bfdf621672
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10668 bytes
SHA-256: da5001ac82436d96097d330cc49787f71f64b952238f4d711386e37c01889f5b

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