Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4f0462a987f4ee…

MALICIOUS

PDF

109.9 KB Created: 2021-06-21 01:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4c08a6654655b522da3bc0ef54b4532f SHA-1: 30d4c55234d3dc9fa129f4bcfe3172f2fb2b5db7 SHA-256: 5d4f0462a987f4ee45cb5b51232ffd4c0ba85885aca7e2d125a8478944c960a0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm or SEO poisoning campaign. The embedded URL `https://inwebjor.ru/uplcv?utm_term=barroth+mhw+weakness` indicates a lure to a specific search term, likely to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=barroth+mhw+weakness PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/467979f632062b4335e874516a10e062/37656677971.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2j2fee4sl3garegmc0uj9c5i3h/gijopijezamegiza.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/1047311734.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/17c30ac816cf988fb72d01ec94b6ec58/baloxupefobafowi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/94190021142.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/aa86316a43e6adfdc08c7a4a47b4fb40/xezupotelel.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8cutvqrh7fdnb1fj2d97phhfon/46131105414.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/muxevegonepolatebudopuxu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99885292475.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b8944584a6d320a9d82a2e8f6d076112/bagomuvidefurinirexalo.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/49464995242.pdfIn PDF document text
    • http://geose.ru/userfiles/file/natogulupogiganumej.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9b20e1e4633863c430e12df6613a0c5b/74122651616.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fea61611b7b81c20cf5b2757881cc25/lunaxof.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d379a94d02cda0d2298f500dcd4ce0e8/4929911847.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/jupaxufetu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b9927665c---52055964264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 24064 bytes
SHA-256: 8b1e55c553f097f6140c6c4525787cbd6abf1e8725819820b300da20b639da80
font_01_sfnt_off00016282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16282 4840 bytes
SHA-256: 7f16ea5cf789dc2516d27cdca4494dc3ab4920fd9959b74cc9b11280f7cdc3ef
font_02_sfnt_off000172d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D0 12604 bytes
SHA-256: cfb24f41dacff0ec350b3d845663b2adb8d32283cebbb4d5a160471f69dc1158
font_03_sfnt_off00019c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C4C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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