Malicious PDF — malware analysis report

Static analysis result for SHA-256 b666cb15b8ad40ba…

MALICIOUS

PDF

80.3 KB Created: 2021-04-28 18:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d86856b6b2d38dfcee29701a03ed0a SHA-1: 9032c1e84ef728ce3231b76914358761f648d705 SHA-256: b666cb15b8ad40ba2d9f386bf063c09fee4c15985bd99e08978d9b5f6421837a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9390

Heuristics 5

  • 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
  • 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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7faed232e723b7447eb15b7af01c993a/73850099417.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0ul9fra68t49iuuskoflc1ciad/jokasisenaxinosonamevas.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608351a0ba9b2---88310605941.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608730494cd8c---rakonapa.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/38c5d1b063606c6b779e503b89625907/18181050810.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8grc4tjo5be87q7vnkrepq53q1/rakikulosedeweti.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f90a0fed0ac5ed367096b38b47e783a9/buxetaguvabikiwafu.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/fd204e8567def71a5692ff81f9cb320e/wurozigezun.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uncc7jo87dgisbhsfou06lueb6/xamokevudugefubujege.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c16f580ab---fosoxijimosap.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/dfb24d7ff81c9084b3ce432eebe95024/kofalavafipamumer.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/208dd3c2438feb61fc23724cdaf7cbdb/27406931475.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fdaeb1b750509dfa1e3b71449a15dfe5/numariminufudebijufefob.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793058623a5---labapozesukojen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=windows+network+command+line+cheat+sheet
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5b.bin
a384bf442d31c864ba357985de1a33e737bab714cfbf92f4e37801c5bbd22ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 5136 bytes
font_01_sfnt_off00011bb1.bin
3fb89ec2cdf2c29a976620395318360e1265b7b5ad33305b3545910c2a0d5663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 11528 bytes

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