Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7e3b2a5f00b741…

MALICIOUS

PDF

72.7 KB Created: 2021-05-17 16:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404ef440446f463d21d4aa67941ddae0 SHA-1: bfc5df774ee41db1a8e5180965073b05cf06e7a1 SHA-256: dd7e3b2a5f00b741dec4d22bcce6051068a68c4d828d96210b86617b12fe61e7
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, using a link farm to direct users to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the embedded URLs and the PDF's structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/90e91c7d156cc6e3cc4d88159ec02730/zelivamevij.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/05e6e8f5f943ab73a6341b1b41e7e42b/taxikez.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbacaf145---77292809331.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609486a27de00---22566212151.pdf
    • http://alliance-ltd.com/userfiles/50514882714.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdce920209---siritijefawoduned.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/72362f5d8cf23a844debbcb09440a089/rabuvis.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hovegk4c3timoe58aul6vvt094/38895996542.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/340a592a68db32fb2a55a6d0c82dbf85/50642545983.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dflu1ddlog325svhj2va0e1t23/favaxuwinikerokapu.pdf
    • https://fablab808.com/nbloom/fckuploads/file/lidesexezuzawafaf.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/jititovupapezejazubasov.pdf
    • http://pnmanagementsolutions.in/uploads/42154695160.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b269d9aea---32295799903.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/085915b5f61cbfb8f6231bf46f0f58b1/molipobugukagigufus.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e6bc248b---pakigoxe.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a789bb806---wodivuvuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=psychrometric+chart+excel+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e117.bin
0bed80e4e0f196748d5d33f6760b31a3216b25e6c53ea989b04c2fe7d6d113a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 5292 bytes
font_01_sfnt_off0000f2f7.bin
9e266cdbd089da06ed3467d26d489bc01dfb07db3e29c2eb8c104a713a255a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10316 bytes

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