Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c649a2215e82e6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 18:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f2b3fa2654da099aefc136e58d95d63 SHA-1: c50c2519566a25b9595d190ac4844ff744e0a1e5 SHA-256: e6c649a2215e82e631c876cfea2207c0f05cb511b0ca236bed88b289f4a69976
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of numerous links to external PDF files, some hosted on compromised CMS uploads and disposable domains, suggests a link farm designed to obscure the ultimate malicious destination. The 'Download Button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://amatnieks.com/pictures/image/mifabibep.pdf In PDF document text
    • https://harkakotony.hu/UserFiles/file/mitovegopakoz.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dviscjta3cbcn5piknrm72r2d/7759671764.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e593cebc739---pafujep.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rasotowawelotadutu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5i9j2d5i7jcge1jch1ur6p8viu/kafomebodunirixep.pdfIn PDF document text
    • https://advik.net/userfiles/file/resufarubesebaxo.pdfIn PDF document text
    • https://majubesar.org/contents//files/futuge.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/32294337289.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/jixalawabilunawo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/zizebotupodewebugurener.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/wikewipesadagijinisi.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/20437825068.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/dujozenogafuzegu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/618dbddd85522ec04c3a5bb116bb3f1b/sijojugukejurakuxoda.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/fijaxizuxenusud.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac548d6156---lobimugexi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vhhorurhpu5m1o8en3lqiucdbl/64534181506.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cda7cdc65---dudepawanafi.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210516234818.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/bexonapukorarabutekizaba.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/11733718077.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a638f004c---fiwiximidiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=benevolent+fund+form+2018+download+pdf+punjabPDF 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_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 11476 bytes
SHA-256: c942129b6f259b19f84ed67a31edd7f21bbf3ceff4ea89f0d3754f08776149fb
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 17608 bytes
SHA-256: 13344e97dae830f133861342aad3a59a0a7c4953ceb8fec19f81770bc6fb3af5

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