Malicious PDF — malware analysis report

Static analysis result for SHA-256 56df0e9eb984dda7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed79a13191b79da3ee4102c93e05d703 SHA-1: 0bbc7f63d86846aa45f6432327029fd3e7e3a3f5 SHA-256: 56df0e9eb984dda7b0f6952e33c99db3c501fb2cd77da6e2d7c075b9a31dc766
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The embedded URLs, while some are benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fju5p0nvm0dn9du4b1amrhq3c0/lerosefil.pdf
    • http://dblbtech.com/userfiles/file/974389822.pdf
    • http://ladna.pl/user_images/file/52184702300.pdf
    • http://centralgiving.com/media/userfiles/file/28761120282.pdf
    • https://tworaise.com/userfiles/file/turelu.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613449a383627---80205102598.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r00m63n0uf3d0npaaqp32c6b12/rozigutubinebame.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/futore.pdf
    • https://alate.org/admin/fckeditor/editorfile/muroketixazanelofaxo.pdf
    • https://rowadalbyt.com/userfiles/files/goresakewosoxuxosawu.pdf
    • http://obasekiestates.com/UserFiles/file/40566501470.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/buxit.pdf
    • http://www.oomewatersport.nl/upload/files/pagiwebatinupuku.pdf
    • http://chiari-web.com/ckfinder/optimist/files/wozuxijugezi.pdf
    • http://sz-nuoyi.com/Upload/file/2021090411135624060.pdf
    • http://cnokorea.com/userfiles/file/xirubesoxaropogebexexegu.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/60802747203.pdf
    • http://architettogherardi.eu/userfiles/files/73085250075.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f99a5a9e---90000603761.pdf
    • http://yourhandmadeitems.com/userfiles/file/wejefoxixag.pdf
    • https://ghnservizi.com/file/41576642356.pdf
    • https://listapp.in/ci/userfiles/files/4897544563.pdf
    • http://auto-rad.pl/userfiles/file/ranaxirutegevavizi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=conversations+with+nostradamus+vol+3+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 16792 bytes
font_01_sfnt_off0000e20b.bin
d7c28538b07ffcaec26bd1baf7799084386c80f3f1e3730e2908c03b68139482
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 16108 bytes
font_02_sfnt_off00010b8d.bin
7fb315b794c61ab3cd39b1d0697b254a3937a34cb6af3b2ba0e8d60e75bb9b02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 11216 bytes