Malicious PDF — malware analysis report

Static analysis result for SHA-256 170e862f05b994b1…

MALICIOUS

PDF

86.2 KB Created: 2021-08-02 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d2ede283839048a5517495b16f7cabb SHA-1: 9605ed8fdce3f58a610ec86c2e66499a6dcc8b53 SHA-256: 170e862f05b994b14d2e4cb3d22e5f75e90cd4e2c50ea8eb4620a5f2f8f0558f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rintrans.com/files/24390794688.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b8b9df63c4e801d204446c6872ece331/79928469303.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/i1utujhnr5a24q7r78ah95ui95/sukonelefetutuna.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/50a1279ef3679d26921e06b3dc11d75b/76577168678.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48677cd05---lerufureso.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/buvuzuwebaxinozadafuk.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a48ea528a2fca912b439bcaf6538e284/63657083581.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/pazajezufuxoge.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/7165753455.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ec3a44c1e5206af9d485fd02979835cb/35649409545.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/18097578624.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/73406402451.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/7554562013.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tr1um8qqruanv99i7a269u6e52/ruzulagorinarigalonika.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058b556fff4---34828270944.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a76499d24---57946523630.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/398842221fca4c586f6abd6b08b54b9b/bufituma.pdfIn PDF document text
    • https://goodline.by/userfiles/file/13511221009.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/42b2a77119e8d5fce414328dd8007f4f/sodanebepuji.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077671e5f0ac---58193728123.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bamex.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/fijolonurizabibi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f46cb8c8291---powafukur.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c182b072b11880005f890d30919325c4/naneten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+reaction+makes+a+peptide+bondPDF 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_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 19124 bytes
SHA-256: 7c93212e701038de926898847e694553a126114dcbd1f755abb058d05a94fa2e
font_01_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 10960 bytes
SHA-256: e10691d3f93e893be6d126cb06d8e49c3f1ec3693d1041b53d3400e45cddb073
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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