Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c41e0a54990b72f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 09:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 118f168789ec6e609e0e6354c3807234 SHA-1: 6b364ea5a37acb5c15ea66527bdc9e70758ee311 SHA-256: 1c41e0a54990b72f9d6a96424cd12e833ad9bbd1ab2b8ecb70a80ea1cf0876a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nicolalazzarotto.com/userfiles/files/xuluzupexumob.pdf In PDF document text
    • http://fioredda.com/userfiles/files/41352624559.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf7400f81---mepodimo.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lijutim.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/nijitariwovajav.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/patefaxik.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/dukigoburikifid.pdfIn PDF document text
    • https://edgecs.com/documents/ruliza.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/af30549dc5cb88e16c67b52ccf42a238/59385071530.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b809377ea001d2f66484b924a4fa6d07/gorefifudamewipavobafokam.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/xukazuxuja.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/43986466649.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2phf6glou8h6ft5o1v8q8pdqs1/notixusavowasanalusil.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707bb768857---jajiwetaridiku.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tigurumularabapowisolidu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/41ede6ee25bc4412fa3168c0151128d6/duredaginibovizedofiw.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/40f964a44770d3c9ab8bb0e087c18060/genetanodi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d6e6f5f7---69321119664.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073796203079---mabifajufada.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbead304a---dobaserugekigawonuj.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/larog.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/32118571522.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/vigovomozugur.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a439df0d2ab---62462778847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tonal+harmony+7th+edition+workbook+answer+key+pdfPDF 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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 17196 bytes
SHA-256: 91ba173c1340706822f5ce3efe66b57543e0f5d84677ae43093c404d53ba6371
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 11208 bytes
SHA-256: 6a917ec2e5aa90ddebaf21018f1c226cc7e046bda74d15cfff60be9f936300e5
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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