Malicious PDF — malware analysis report

Static analysis result for SHA-256 30acd584f4cc0846…

MALICIOUS

PDF

67.5 KB Created: 2021-09-22 20:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06203217e382eba55422f898118c9f38 SHA-1: 2c0791a77114dc10739fa6980d20315e973482ef SHA-256: 30acd584f4cc0846e93df6504e12411eb9367d29679d2901c788438ff0445604
124 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various URLs, some of which are hosted on compromised websites. The ClamAV detection and the presence of multiple PDF heuristics related to link farms and compromised uploads indicate a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and heuristics point to a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3555

Heuristics 5

  • 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
  • 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://bda.ch/ckfinder/userfiles/files/xapumefebalarularalezofik.pdf In PDF document text
    • http://epoxidice.ro/mm/file/guwejamikirutexop.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/bulugolosenapidamovun.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/70525264949.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/54200012476.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071825462870.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/47957237463.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/zukokubejademisuj.pdfIn PDF document text
    • http://bankerz.in/qpic/files/15054205800.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/20b3895a83aeefcd7bff83d41ed76f44/86485949789.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/kitununepaxipegiresolala.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/lalawoxudazapod.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae82539c8b.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614781a3f1ef9---64128467873.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/veruwasedinukedopawuvipax.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/83555219200.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/kinozufokumug.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/jedojuboworiwuroruxafiv.pdfIn PDF document text
    • http://szhlfz.net/upload/73594644139.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/69402492603.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/ximerisakesig.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/gekefuleluguk.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/68032305492.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902231209962786.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/80598206023.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c84a791---jexupitoxurevivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+real+rc+flight+simulator+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 11348 bytes
SHA-256: ab7b741b403aa1ca98814020f6d2534a56cf1b231288122ab9b5398152632888