Malicious PDF — malware analysis report

Static analysis result for SHA-256 d999a1eda25f43a9…

MALICIOUS

PDF

120.9 KB Created: 2021-07-09 04:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5f36174f4e081388f0c611c08e1cb6a4 SHA-1: f953dfef469292b2e29c9ba3fdd011755f4ff9c7 SHA-256: d999a1eda25f43a9c2d27992ba2827dbfa1aaa0fa231b57cfabc22ac48bd9d90
156 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 a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The primary goal seems to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rululrkhr1dakamq137pjp0s6h/73059457720.pdf In PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/84175165027.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c9e0d78322e9e8e172317c606a45e46/27489101072.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/20d81cced4d890f7eeb95ddf7935829c/60532210487.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/45009174823.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vasijepedamogoref.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac007e869a0---rudow.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/42820183340.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/tugopekixapigi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/43532383086.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c34f3fcb786943e0e01396d5db1aefab/38158135251.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/wexoseratomo.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/xanikezavifixu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6fc45c223c090c4ef0104fc72513e434/96612164861.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73f8edcb68---70196105975.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e47b83fd5b8991f1001f2f0a8019b053/vixamegate.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eddb1e4d8---53085659371.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/35767971672.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zivojejelelamozube.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f543dae6---vavusip.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o33m8scc6fa2pvb6hnv2jvnp7u/riletitalabajonipewege.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ljgmmmf55dih9f812tt1sff2mn/vofajiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chinese+alphabet+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 20676 bytes
SHA-256: 7e132880cabcddd52232f32f73e25c965dda6ffe97bee5ebedef42be8c4f93b8
font_01_sfnt_off00014d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 10484 bytes
SHA-256: a1b264ea7a0b062dc2d52b18800d0e59c7f2592c8200a176b5016c0e3a41c641
font_02_sfnt_off000164bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164BF 32432 bytes
SHA-256: 4c7444acc2a7b02dc4fdac8e2f32a947ce5b8c455872925b61ca2e213f1a0a3d
font_03_sfnt_off0001bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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