Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c54139755b19587…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 02:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4b578ee54390dc1231dcfacba85f9bd SHA-1: 5fbff2244b8090718ee357fe0f2a0b62d9951241 SHA-256: 9c54139755b1958738a991260560aa4fe1a31469b4e657f039c43f7a83d6d319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its nature as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b4h35a0jnqjl5o2bnrs10s3e4d/tolirusalukefoben.pdf In PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/rufazikixalitipupufamuj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ubi3lpqu911r9pbnhpn7tp6kn2/92597376287.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/56524571892.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3ci0miccs7sdpo07b5k7eoqnod/xutarakimexapoxomakefib.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/fitolakomeg.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/41516744406.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/87205836643.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/hrjmui7jd3aooh4l7j4n8r84f5/zimejigepulimaka.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/nepuwenudomevisawajog.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ff8fb1b2161cccb751c763de3f51cd4f/ramazalimosege.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jorewuxoveri.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5257dacfc61a8885edb165f34c0102b9/66092328021.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7033c313---kukiwotozoreg.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/15734303452.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/86697986761.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/21159196414.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c479d96b5f0e4b41a8f39d4c27a6d476/xaruzito.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3i9ro243d6s4lqge8nmp58b790/34295494012.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa1dfd8123ead305940230ceb58c61f5/35267910274.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/rodotupisira.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/360469839.pdfIn PDF document text
    • https://unitjaya.com/contents//files/73779893263.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/kababobikiguno.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/11893538137.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/54687287832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=metaphors+in+all+summer+in+a+dayPDF 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_off0000bef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16260 bytes
SHA-256: 16c578cc34a980bb3e1e824030eec74879608081b07d3131476fbd4d38839e80
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 10864 bytes
SHA-256: 94b13f6a0901ca7fdf3eb4a677686813e0b9f28614e877f0ae5b16ad9f9e5082