Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc6c9e5d243febc…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 01:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 17813e64fed50759367efbaab51aaa33 SHA-1: a43508a4cf3d8124304bdcb09d294c4f7a66a8a5 SHA-256: 6fc6c9e5d243febcc473e41df2ca2a463a7da97b1678a6dba770551acc982036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=hypoglycemia+evaluation+pdf PDF link annotation
    • https://bangkoksolarpower.com/syner_upload/images/files/zelorowolezamuv.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/fodegulemosukivaruzalimed.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/49957700341.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sdmg28srkpgd6gu309v6bv1ct0/7490170571.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9f2f36a818165be41fd1b6ebcf10232e/76144640155.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/19136296162.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f34358250815223a273672b3f8f4c475/rojume.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/59428539477.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gusuberulumubufaxamober.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/27606155700.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/763c750bc6494f531f5d2c737a660c45/zifukidumuxurok.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/91385093913.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/viporuvewobuzogu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50b21c434---bosubewupil.pdfIn PDF document text
    • http://hodori247.com/uploads/files/bugewudu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/29170206023.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1c5bbc25b70db3fe605d43600ddd033a/sexotolazawa.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/zonarisuwiwukibopugitovu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f2190ca24eae68906025e2b167fee612/gavujiwuwibomupapilivefe.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/9a2a206a6c2ba3f3ad80b5ccca0d299e/bafuvim.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/47924325038.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683127ed20---45294850945.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061309261570554.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/20538167476.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_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 15432 bytes
SHA-256: 4a3120011e679316081d4923e51af8e755919b57f82b82f5cbda96fa046f1ab7
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10964 bytes
SHA-256: 5ddece49eb3793196cea06bf8e60d6b72e848f14bc472cd67f17ee1eb40204c3
font_02_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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