Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc414f93250acad…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 12:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ca7006c230102816d825174709cfa27 SHA-1: f6ade31783e851602109a794dee15c3dc759e124 SHA-256: 4cc414f93250acad2157e81cf0df5f945671ea4d7e6d8547adfe7a48386e5715
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=tekken+3+psx+iso PDF link annotation
    • https://mygrind.ie/userfiles/file/tuvogomika.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/96001453440.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/seguwarafamoba.pdfIn PDF document text
    • http://empresa-venta.hr/files/85607646848.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/webexeridulifogixuk.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238f8513fc---bewaz.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-14/20210914042514188607.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a18ee1ab615b8e1c2052c759f898365/vedonowabalap.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/5083961715.pdfIn PDF document text
    • https://eetravel.net/file/gepukevuf.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/42477979232.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fiwipozaxofaxadaloditimi.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/tawitumuwelazi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614500695d2fe---luwufigitekafinabanevi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/putavuverewe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370de30651f---28458139761.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/84596820853.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/dujajupuzamamivi.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/gibexukivinonijigerop.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/dowiferojupukinotefaxij.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b9918e0b---gavewatekut.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • http://tecksco.com/upload/files/zavutukibif.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/nekimuvuxipaxuxug.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141970f3a097---vikesipozidunatezalunujel.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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 10168 bytes
SHA-256: 88604bee91891b20ec78f0c29fe604bbe77bd3f60bc8badeec1d3825d6531982
font_01_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 17716 bytes
SHA-256: 2900934a29e475f4545429c816b9e1327f5188bf704881f40d4c26356f75d779
font_02_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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