Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6f3895bc77783a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 13:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a72f7b195f1fa8c424d83156cb9daf41 SHA-1: 7e24a7d4565579b71b156e726719846e1dea5130 SHA-256: bd6f3895bc77783a5fea9209250b994c6a195b00c6eb84542843e6e2724d8a74
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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 http://dirpub.org/editor/ckfinder/userfiles/files/volufiwiwovosopu.pdf In PDF document text
    • https://anyimaker.com/upload/users/files/7922312673.pdfIn PDF document text
    • https://topupdana.com/contents/files/popatijegemutakik.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bikofadiresevefem.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a5ee0af33ad9613c62845f7ea057319d/23345469437.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090222063273499.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/668b17f0cd1e9e2794fe06146e8db1bc/nuzejifogupuxagamixom.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/85093984817.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/durabosufibopotavotiz.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/68526552017.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/39242471632.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/45541189569.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/37197264954.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/limokerijegovajiwu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161402191100de---denugufu.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/dijuposamavudizijole.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/59576569416.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/54784231844.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/96814676511.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2d959832325ed081f771696c81ba7e25/56434195873.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/71909426884.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/xirokegaput.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/ranagobol.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/donoperagewemux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+remotely+control+android+phone+from+another+phonePDF 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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 17772 bytes
SHA-256: 49bf569c7e5e0ef9ce7a3aa2b7e58948f58a2074db1b2cfbee6bd8227fe38a1b
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 10908 bytes
SHA-256: f2dc8ae3f0deb10f59e8fd7aee1671de4af404037cecb2ea1f3f69d2d0e6d2c8