Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48397057e3926e6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 09:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4045a630f89323be8e5f2e2697706131 SHA-1: b14b7747f729f6d32c28482ae053e95f79bf03c4 SHA-256: f48397057e3926e68520444b2938ba01e383ba37ea03b8f4d53c88d0d2b0b7a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The file contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate an intent to exploit users, likely through phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=measurement+worksheets+grade+2 PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f20cb4606---50111051379.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/66497603497.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ci2c82rqpd45o2bpeu7h1uil77/nipividavata.pdfIn PDF document text
    • https://abeess.com/userfiles/file/2403878940.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/29984615651.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/74497062864.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/zogov.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/46faa777f2f1861c6e3d24c73c410ff6/25698447779.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gabonifisetudamem.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/wazajitakurebidemi.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/83635332150.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/63871204395.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/40462580650.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d92f881a246d682aa5de424a9c5f75d2/zewimidutotedar.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/badozubomogexa.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/misogutugeminobasi.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/76341438236.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/85370596842.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3013b76b---zobujuxirakak.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/24821009884.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/nimemesurafibutebage.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/47234181546.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8b55b9f821135cbefb0d3a23cf6ce72d/toxugijidumilukafekovij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33fa826b1---80374736681.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d091e3d7bdb3f88245c5b792fbee80a6/sutedize.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17756 bytes
SHA-256: 812b84ebff5e48eeadf2b5a6ad9416b86cc122927aa2de19e4a3aca78663f337
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10948 bytes
SHA-256: 16836f8654e6670239bf1ded56184ea338bcc189faa761cf735a014d150e3620

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