Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebccccf908e4bb56…

MALICIOUS

PDF

86.7 KB Created: 2021-07-22 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cec4a5fb60ff8838933ef38e03a944cf SHA-1: b7ec1900ce36fa71ab4a490cd131833f5ba743fa SHA-256: ebccccf908e4bb56f3e317134e0b6fcd26730d88c984326a0f12ddd2d152e4ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb3eda877---jixafaloxakaxerizinime.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/nidisufalowidim.pdfIn PDF document text
    • http://stroi-sistema.ru/img/riliwukaxakasetogo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/98681443685.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c1b83e414968ff1c4d06203172bc35be/37118312327.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/61921356506.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609940bcbeb5e---ruwijivijusavesofova.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/76553723608.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021061216073470554.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/51066691687.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/nurezip.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9aa120f0---76487923528.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/banoreretubejikomaxesav.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607886a01c295---3358584077.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/h8q5otvr9adrn4u93bogeu16r2/43345291331.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/gosivewuzerivutatu.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/gedosipifowudowes.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5fjoo94r3eodmleg0mc6e8csrd/vepumijavivova.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/q3qrv8es0jcl1aiooofgtbulal/82233904818.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaae5195be---85205865134.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/xiguwomil.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf92123b5---31015993716.pdfIn PDF document text
    • https://memoservicesrl.it/file/gokurulenabakarixugekeduj.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/32337909526.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c62aecc102ac8521b40b42c6fbb7c35/50180867524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=experience+letter+format+civil+engineerPDF 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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 10808 bytes
SHA-256: 263ec09f01071a8f37604319fbc50ff5b2d07d788fe62a90f92ea1f584d60884
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 17400 bytes
SHA-256: 2c36936a609c12dce751bc1f670c0a86a41dcbb0659e8a7373336e2d2440b9aa
font_02_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1