Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a99c1377f635da0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 09:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3db6c48690f8a53b02370d6826e43f0e SHA-1: f4c593a28946ec30584f53fd455d798c2af2c643 SHA-256: 7a99c1377f635da0a853bdde3948d21dcc605a9ab25d84948bf67bdd0019febd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted from this sample, but the presence of multiple compromised domains suggests a coordinated effort to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141530d26a1f---besiwivimizadususaxuguwaj.pdf In PDF document text
    • http://kozhencherrymtc.org/userfiles/file/31480858259.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/72058d5244298e6bec86fc824994157c/78109915969.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/28089181249.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jifupavuzizitilijudifom.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bokemejolaf.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/zipumusipiwoxotimof.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/22909493338.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/26129523457.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/mavawelakabo.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/jolanux.pdfIn PDF document text
    • https://kiptep.ru/file/nusepoxikafagu.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/6211518397.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1ea28c7dc56dfb27ef1eca04bcaecf71/kowisijepodiziwel.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/64284236638.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/jutumudijazijigu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161411ef586f61---nuzikavaz.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/sogama.pdfIn PDF document text
    • https://loyd.rs/images/file/xafepubosorab.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/duriguta.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/60679523515.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/1668638007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+10+note+5PDF 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10152 bytes
SHA-256: 1cafc5d3b50b1178e1afd4930daadf44172fb5ad4b8237645d25ce5dba872d86
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 18472 bytes
SHA-256: 88bcad09fe4a0d0a672feb9d8de98c0c7f8c04b062547e617ef7f3eb148d15b9

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