Malicious PDF — malware analysis report

Static analysis result for SHA-256 8babf8676271702b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 12:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a84a8f8073b3a02520ae34b3150c446 SHA-1: 445409ec673e19a11b00302c6c504755a9e02f37 SHA-256: 8babf8676271702b69891d40d41de77d0db37cdf40734d8e8cef759455f8ddf7
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a likely attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://grandfiltr.com/files/file/22314634455.pdf In PDF document text
    • http://defhjdr.friend-match.com/upload/files/63745541942.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/faruxaxowujojojesotivin.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8ad525b00ada1034c18e61deb12375f2/mutumiwofed.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16316001511.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/pobuwatejamorem.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/13713111725.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/52733111508.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/rajakefiref.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68a8a4473ef799e298d2327911413b88/98310495717.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77739961960.pdfIn PDF document text
    • https://landi-bg.com/images/file/38411932308.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/dedawelewowejiwejaseraber.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/maxufokajegol.pdfIn PDF document text
    • http://reopen911.info/media/file/83257922694.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6612fb61aebf17ef68fb8775edd15ab4/15643356921.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16139d06c0bd5d---setudutobigabofibudi.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210916180858.pdfIn PDF document text
    • https://media-get.com/userfiles/files/11075841736.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/97271996898.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/sajazulorol.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jamewobazibosalekozub.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7m43c9t2g3glkkff6gvhaa3p4i/44586437556.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/90381987768.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/31762040404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apocalypse+dreams+lyricsPDF 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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 20548 bytes
SHA-256: 94e68ae3658c4bc62e8c4409ebf9b3644154b145dc24b1cb41e16b144504cde6
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 10568 bytes
SHA-256: e6ff32be912a402c0a9f19846be4e61c86fe4096116c57c91f5ac3eea5ccb259
font_02_sfnt_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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