Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c29c6dd2366131…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 10:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12ead0eeebdd7afcf4e8aad751df180c SHA-1: f1e175278902e730fa9ec22103f03a5ff071b41b SHA-256: 10c29c6dd2366131d358c39efc9338336afe6289377be25ff10f47fe8b1ccfb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bulendengin.com/upload/ckfinder/files/lurilubanodetasidovega.pdf In PDF document text
    • https://adverto.ee/userfiles/file/35156167161.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/80933651189.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/bujexovaxatuwofirejalorop.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/jetisosofuditiwo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f699548476---22948321690.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/latiz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f85d387f9f8---80314411870.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8892lhisqccvpvqv5fik6n3p45/50869893320.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f605ae1e---segipinip.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e6dc61ff4---44603741669.pdfIn PDF document text
    • http://24cvety.ru/upload/files/pujel.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d894bf70f1b---27022272711.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/80711568187.pdfIn PDF document text
    • http://benetalent.com/upload/files/95425529396.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c8f873020---7921049049.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/xiboranunux.pdfIn PDF document text
    • http://juha.be/_files/file/67015083892.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/visajezavub.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/lerexumubafagoreven.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/potasaxiwatamefos.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/zadejew.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/97232768213.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/rupir.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/19410794896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=7+inch+into+mmPDF 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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 9840 bytes
SHA-256: 5051bbbdbfd8b09c7f3141836fea190c40ee895970d37cd36ace2341152a8881
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 16580 bytes
SHA-256: 0624299798e9393b4994acaabfd68559ef605d66c241e3aacf99a050ba4feda5

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