Malicious PDF — malware analysis report

Static analysis result for SHA-256 2331ad526dca940c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-26 00:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12f3a79134834793568d7bdb7f664387 SHA-1: b2d412b64653ddbf132ff1fde88902c20e8568fe SHA-256: 2331ad526dca940c0964adfe1c5e1807ac86abeb5a5d96694974eccb0cc708a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing or malware distribution. The document's structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3cba79a51a77d2199449366e48403c84/gugobizodezinadosodavotim.pdf In PDF document text
    • https://canionglobal.com/FCKeditor/file/dixiputefagaxumefu.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/30263480591.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/63545323945.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/jerolulopemipenudikitol.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/xirok.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/wefozinawusidubusokaditem.pdfIn PDF document text
    • https://bem-sa.com/img/file/62644805340.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nafujurodalev.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dccdb0c81991c7042f8c07a7b6019d39/wunagetopitak.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/luwapoxurodefoxutavopo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb19c1d81---gilibinowenudapozazumerod.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/3955826748.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109011419065018.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/lanefezane.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210901175524.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/89589969627.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210922_C9A1CE6E6B8E484C.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/31858806654.pdfIn PDF document text
    • http://chenruichem.com/upload/files/14400631487.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bufabarositenapelapo.pdfIn PDF document text
    • https://koratspring.com/upload/file/77741196948.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/narebudagimibolunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+port+forwarding+hotspotPDF 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_off0000ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 19784 bytes
SHA-256: 62bbe0e65b26c8cce9f9b7139ccb617e6b98747a92a37df98e340d3b7f8e8230
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 10668 bytes
SHA-256: 592dc714a4c4cdebaa474296170517826652da4a0f3d4476d2d8d06d6628e732
font_02_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1