Malicious PDF — malware analysis report

Static analysis result for SHA-256 a617280da3add03b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-22 09:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c579f8eb73147ef9091b66cc8937a21 SHA-1: b9fd816868d14d542b400fddce7c5ab60751ddb5 SHA-256: a617280da3add03babc09b1fe09988783b0e523c98a5043d90291173b6811133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_URI heuristic further support the attack pattern of luring users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=best+android+sensitivity+for+pubg+mobile PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/44742757707.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dd524826---wokalimim.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/kozuluxubegojipafikawe.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/rasugagawurofuxitegaweb.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/gejijufoduverevuk.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/99898830283.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/tafozeraxutasesegaxojaj.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/63504434862.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb5ad0040---66858266527.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/tadamaxobomerupileg.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/xitodu.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/46909294228.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/xixezenuvuwir.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kexixexosarudab.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/72862391908.pdfIn PDF document text
    • http://chinahongji.com/d/files/60112686977.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/kaxojizobaxinilixogogexog.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/57666707794.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141db0573857---mazamezurubigivezo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c640b116---81180111403.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2377699a---zuwesek.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/25041981579.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/sipuwujizesemodo.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210916163539.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/2187576385.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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 16372 bytes
SHA-256: 50dc8767cbb1d5e67b3fe0cd19e6a570e45e8b5e71517de3f950b3a8cf1c59ac
font_01_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 11312 bytes
SHA-256: 434ac403d505795a1a2d4577f4867922c53acaa0dfd895c2bee58ceec1988b87
font_02_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.