Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcc2f580bc7dd7c…

MALICIOUS

PDF

79.0 KB Created: 2021-08-18 17:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 968173a3cab380898e4e9cc97ef3a172 SHA-1: 5d0c08e3c5aa5e0264a12bc6e07be739d8e46917 SHA-256: bfcc2f580bc7dd7c40bf4eadf987f4420d9cbe4e25baa353d0c96f41da05c8b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple external URLs suggests the document is designed to redirect users to potentially harmful content or exploit kits. The ML classifier's output of 0.882969 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8830

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210715235111352540yz0r7o.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0b34be850afad6e6731a33a0e5568796/73279779332.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/3976103010.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7fdca270---88431404606.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vakum.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/30081369687.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/218570740911622947678.pdfIn PDF document text
    • https://immobilgold.com/file/25044463373.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/ridovukon.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967cd284da2---totamilibafe.pdfIn PDF document text
    • http://giga.sk/storage/file/35500076480.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e352bc82---tetidejovelegadod.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/71234231027.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/11520003674.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5b806212f079450a0613708f6e63d323/lavukifezoxolabonavolapu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dodobimumezagabafudeturo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b8b8cd696---nafenegitigeref.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077252b4fbdb---37661528.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/44731151799.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20936737693.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/96233437850.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/83743108546.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114e8459aca7---fomenimuxomex.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/91713452868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+self+insert+webnovelPDF link annotation
    • 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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 10748 bytes
SHA-256: e082bfff1d9a1b0a37914db88e80b8590f03538c32d929bf57283b3deaa5dfd3
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 17596 bytes
SHA-256: 40ef3e0fc54e68b67f94b5b86e22484e2fa02a950fb084cf81e62b731b28d73e
font_02_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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