Malicious PDF — malware analysis report

Static analysis result for SHA-256 1913184a723546b0…

MALICIOUS

PDF

83.6 KB Created: 2021-10-08 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a046fa63e6a7a0c579843a916fe450c2 SHA-1: 40f02b2c63619314fd22fc7d2cf8e25fcd53acb5 SHA-256: 1913184a723546b04ea9df8b133f536dce61d4a38c3dfaaed69b15eaf1c581ad
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 a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, likely intended to redirect users to phishing or malware sites. No scripts were extracted, but the structure suggests it's designed to host numerous links for obfuscation and evasion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/79349182882.pdf In PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/52822657831.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ee9bf9f1d0cbf820b2524d0c0fad75ef/758306807.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ad3807b86489434404ef80777516c73b/zabuza.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/18996628948.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6e884915---kiferuvawesaxofoxa.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/26528529282.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/50351180895.pdfIn PDF document text
    • https://alutat.com/data/file/97003336291.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/gojoxaz.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/nogemolulovolifixojediw.pdfIn PDF document text
    • https://dafelia.com/files/28028867572.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/84599817050.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/17781570408.pdfIn PDF document text
    • http://trovas.com/userimages/32801501575.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b609c91a3---93323709929.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/57511488505.pdfIn PDF document text
    • https://manenshop.com/upload/files/puragaxoxurikafavasaduvis.pdfIn PDF document text
    • https://akconta.com/uploads/files/sakonosebutilamok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=intro+literature+reviewPDF 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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 10136 bytes
SHA-256: 21771d9504e97a94b43b2acdbb7eb61843297f19366ce2b5921ee60d06d8e609
font_02_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 18028 bytes
SHA-256: fb27a81f887c11dca8798c2581b61275c832fd2c105b6e580206bc5e7c6fd487