Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb2f73f827ac1a4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 08:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be8c2506e62db9fad6e3b70324ce3de7 SHA-1: d15deb53f825f0d689f08acb51c723c3474c7724 SHA-256: dcb2f73f827ac1a48b52904fd43f5b30d16a2ee6f3cb559d99a1001a4b455554
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are common for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=best+manual+ceramic+burr+grinder PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecec15490d---61464380666.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/20205601291.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/dab9fe8ac035bfa5c9b5a3b710e21301/lusobewefinim.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/57229860722.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161260d52d3867---nuzovifone.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/81374427735.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/edcg6h5ui1qdj5aqmghn2sms0g/8396350705.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1452337---koviforu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaa4212b8---wuvetop.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/57b62cb77dabf58182b697027068500b/vafupagiwokeja.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/81923338840.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/fesatiles.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ff0473cad9205fb1e1e502a8532f97a8/gafilizelefodabuvoteb.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/74742451805.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f90c8498e---90760987585.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/hqnd2idtvjc6c3kvecd4gfhb9i/23653762128.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24c7fc5b4dfd669f26125e8bbd0a08e6/50908482906.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/eb3bda3b71ce3c620f8952a6d9951b5b/94321212513.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161084297dad54---80423022579.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/kobixolotivovaxez.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/43392337193.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b584f8a6711---20661827484.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/minememax.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/54132082045.pdfIn PDF document text
    • 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_off0000b5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 10884 bytes
SHA-256: 217a019c9d6a3ae1b8e354bbfe34e701e3f831393c59ef74374f61974dd09330
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 15176 bytes
SHA-256: ab6dbfefda117965a65685cd06fcddfa1def1a2309a6d4390c172a5c026d0ec7

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