Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5ba24f1e1e30b5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecfdfcee901afc350bd83713130764de SHA-1: 184813cc38950dd897f4dd301b17e9b4e1f09c4f SHA-256: eb5ba24f1e1e30b5f4d32e111815d870b4f94e2f15f1c478942ebb2310107367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=nikon+coolpix+p5100+manual+pdf PDF link annotation
    • http://grandviewcommunity.com/userimages/77197069169.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/gijomi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c255a5a353f77a62526182e852ab5e4f/rimujenuzipejuxoxofibuwal.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/46705211200.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/50914680400.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c54b691d1849c1285b8a636948f25499/wimidafapebusagemekezim.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/lonelejozenizevak.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/futamevaxen.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/16767766879.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/21108598048.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/mafupovapalexupad.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/58952346469.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160791d6d8aa74---zoriw.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100703b3332b---jasakuli.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96796969660.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/55613744606.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430f624725---nenepetem.pdfIn PDF document text
    • http://dolonchem.com/upload/files/pilumivezajuwoveseju.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5c50f3860---kerikaguwonudezenej.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/kebonasipop.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd101b0e3---nupotaburolugavonobojot.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2413a35ca46380f1fb6b2693cfd3919d/tivunepazutujiwenukek.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_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 18192 bytes
SHA-256: c9632c476a51bafa8edcd73ec44ec737b2daeec6600e49784b12ea7a2626c693
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10860 bytes
SHA-256: 6fb90cedc0f9e905329f8beb92cea9a6bbd31f758ea6d92a9bc168c5fc23d9ee

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