Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4a41b51fff4cc4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 02:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8b6065a9d2ee35d6686d66c66deaa8e SHA-1: 225deded0b355bc40c0ae9975b05bcb230fd3361 SHA-256: 2d4a41b51fff4cc4b86e87875d9f3e7ca169bda9ec4d71d72ef476a60135b878
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The PDF's structure and embedded links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://weborder.cloud/userfiles/file///8985890215.pdf In PDF document text
    • http://jaqalsports.com/files/file/samaganag.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3254996ffab66dc8249304293ba6a62/turalamumuxa.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/gifidomivomuw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32f71928c---66140585475.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/acpjk8ceveri6tqme36lo20b8k/renamefafufidizigo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427cb5f17e1---6159402412.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/42441559225.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/au6pfoorrcua6a1nksch1108sn/nogimupenazipumakifo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/93928775139.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rovukilejetafef.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/bevafaro.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/18180454006.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/96665900336.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/koluxunavosil.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/tunalerurizumafed.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/22824856083.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/44373230962.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/73320540763.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/9424819082.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fomokebetuvidinu.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614266c44eaf0.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jixojezom.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/xudatutav.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/zedufazejalisawanijatago.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/kasesul.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/63890218081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+4x+best+romPDF 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 10464 bytes
SHA-256: 299d33e144755ff6af9af88fa66ad09191debf20abbc60ad8a6fdaa616c2d6ba
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 18580 bytes
SHA-256: 8555f397b7548285adb08dbb9e6f81e9ab1d2db719ca02c2abaef31912fafc1a
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1