Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a30a3495a250d76…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 09:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a04b245055eec56798cfd1e2b3a4d7f SHA-1: 19dc01b8227a16da90d65753d6cf3ee4898d11be SHA-256: 8a30a3495a250d76846ac5921a7df922e0e444a020f370001a61731e22e4ae22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to lead users to malicious content. The presence of external URI links and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=susan+b+anthony+suffrage PDF link annotation
    • http://tylincms.com/userfiles/files/fenuzivu.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/73907826644.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/fuvuwirifomefibumezujil.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/xisobidiwavaroguj.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145923f7f1f3---sowumamedoba.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/80295860880.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/latogoragerobaf.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145df403ec2c---zuzudijepumosaxibapiva.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/rilewovefuzakip.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/lufigudid.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/zozufevabekexenasosobuve.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/23812353583.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/jugidavatoxajazipopobub.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/setez.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/wotoxodejemoda.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/18548413286.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/67875851270.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614bedc561725---82630325904.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/49978843693.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/xesop.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/lakukedani.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/lisanejawar.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/51670497532.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/65816489200.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/xawatozogedomabonevuxege.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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 18172 bytes
SHA-256: cdf0448f6c73aa30ce8d1f241b95a551f38f6e2b72725da35fb32f960df631b4
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10784 bytes
SHA-256: 1299e05501814dbb1757db38196151f61f5b2520af039be2bbadbfb0e3fae64e

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