Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2dc8c913f9b4a1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 17:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14fdca486e2f533bd260da1c854935d9 SHA-1: 559c34e63daa81e34522253438717bbbbb303106 SHA-256: 8a2dc8c913f9b4a1778917aeba38fe63658f1fe76581da73fa0efae6bf1f7519
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised websites, likely intended to trick users into downloading further malicious content. The presence of a download button lure and ClamAV detection further supports a malicious classification. No scripts were extracted, but the overall structure and URL findings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://begili.com/uploads/image/files/dinejexekifevelunim.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///2021928135957.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/lemeviwowiguzal.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/kumabewanusagisobipino.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1b569f53---lakufubomuguvavozoni.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0283fb1f---vuzimasiwuzinafuguwoxub.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/60138117021.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/11282037381.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/8741436090.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dedareluvafuwomobe.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/36100484145.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/rabenutidi.pdfIn PDF document text
    • http://okun.su/upload/file/69480905378.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f75015da416d3c54917965756e418310/52874019966.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/57219502445.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jobujamoripukagi.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/punisof.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/7669309046.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sevijanezilapiwaz.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/baronasew.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/vazaxuzubagepixuraxoma.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210901150333.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/bifan.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9ca4ab24---guvopelozofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hidden+hotel+apkPDF 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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 17268 bytes
SHA-256: af07a0db9e714e48b4d0ccdcd8afa099d58ce855efc58ba9d18f0463145c35ff
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 10304 bytes
SHA-256: 99dc10ab045b2a928049c4d66d550f077f5867ed1151a716311a6387f5c92021

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