Malicious PDF — malware analysis report

Static analysis result for SHA-256 57feb6eec7f87ed2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 06:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82b1c3ff93589d6a485436542bb74ec7 SHA-1: 984ed152c9167977ffe5650f0e29297b9d0af96a SHA-256: 57feb6eec7f87ed23239a3e4239e479e0f475c54c581292da72cc116b088796d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bibliothequedesarts.ch/ckfinder/userfiles/files/fuparomivukupax.pdf In PDF document text
    • http://papinchess.ru/userfiles/file/32968447587.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/joxizubobura.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/xutaro.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414a1c32c03---2633265804.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631134565.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/wubakof.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/82763565255.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/mulamiroxipopozirapa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66fb107a9---gexuwoxezitokafivawab.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5kt39vld155lhgpjfdi0sg7dr2/12714296141.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/65218502804.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/doxaborivijotusij.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/xobejilatafarutesokiwub.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/17453295687.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/1707801322.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3b08112da---37924374325.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/batezoxazimotomiruzukawid.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/bozagikojiwok.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/titekobolawesumusok.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/wiruwuxos.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347acb85736---81785408423.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/8530412336.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/zodevulakudizemarapexupu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/77036551035.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/puminumebarasedamape.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/madebuzatogijudukus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=putlockers+movies+free+onlinePDF 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 10592 bytes
SHA-256: e1727818be775388c4e7050d8fc3c9ebe3f5f08cd7476ff340606d942753ece5
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 17188 bytes
SHA-256: 95193832e3d1164ba4c4927fa8b9e4f542d1dd42b128efdb29e66de52c64fd0a