Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b356b38b1fbd74…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 01:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2c5aae5fb9884b1f75b3b925975b716 SHA-1: e4d18b5feabc06d44ff5fde68386fe5df2126b27 SHA-256: 58b356b38b1fbd74a602565a16ba62c9c3ee3d552e1077afe26f264515bca6cf
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, leveraging the PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/jorulumomumu.pdf In PDF document text
    • http://michellenevinracing.com/FCKeditor/file/34823441040.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mirogewotazokojirutojefi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q0u5igcfd9lnav19r08tv0giq6/1116511432.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/86dodfi67m9la3q802hto20t71/vowunapak.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/12621585668.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1721925bc6---vebobus.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c918f2eddbe---26941167221.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44a3570b3a---liponogaseretok.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-2/20210702171516966786.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/dokajilowotovosobosu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/oj993q0ladm4l4nce40uue3odg/tekup.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/72974269638.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe36a0b2---91060487977.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1f9ad2a18---19794346207.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/dazovi.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/vijakigenudosurefuf.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53391419e---janelukelusaxer.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/lovug.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/33ee609c28220c2f31d22d14a32d4d63/88193200296.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074b210d2052---23429013061.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/beb22f00a1435f9e39fc3fa2e67cb05e/46268112317.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/sefoxedojajewolarutul.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/42908142810.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/28193334900.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/77150667444.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/942af4e650225d5a2204260bae245895/taduzekugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=for+and+against+essay+introduction+examplesPDF 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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 17008 bytes
SHA-256: a4a8afbfccd26ae20172ec49bd38702f9fa140a283124db1a93a7ee618e9a3d3
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 11152 bytes
SHA-256: accc8fb4c15062b711fce8ae2a08e74bfa93cb0e4f7c80bfab5be237b4eed5e5