Malicious PDF — malware analysis report

Static analysis result for SHA-256 179a540b1211f159…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 14:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93399b3325cb091ea03bede3dae8fae5 SHA-1: b2c2195815d957ed7afb4bceb609a0bfa6e15d22 SHA-256: 179a540b1211f1595c3d3f303a5aedcdd26da4d4503b337ef18bb41e697b5e99
176 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or harvest credentials. The presence of a fake CAPTCHA heuristic indicates a lure to trick users into further interaction. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a18ee316a4---vonuv.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7858a449---vurawezezevinupofujo.pdf
    • http://aarogyamedico.com/userfiles/file/84647786523.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a951810a5c9---bunalogidajojoge.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wezonopofizoluxepekudivu.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vhgc31o0a0nrkect5ipbvkd7q4/5101742461.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a76aea8836e60c4733a753e9dbb97477/41311375563.pdf
    • https://sharadsangam.org/UserFilesTwo/file/rokaboguwuv.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/31806c0cf814c86fcf9a5249894c3d21/kiwizufepawodepibogime.pdf
    • https://accuratesearch.com/userfiles/file/tufoge.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70e228f91---xojanekigoxo.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af8aeae7c---bupenalexarafasi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d359065f832---muxozofuwodavagab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+free+fortnite+accounts+2020
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/47a9af905126acd648caed0f9fc1e318/33296990984.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b0.bin
567ac365dc9d0e0312769c5f4df5c14d76c5ab360d686a12b125795217abef05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 17672 bytes
font_01_sfnt_off00011006.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 16792 bytes
font_02_sfnt_off0001281d.bin
ee383fa5ca9d2bb2cb0d8594a40fa81ed1a1a834f2346d4934c1da822d667066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 10884 bytes
font_03_sfnt_off0001418e.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1418E 16164 bytes

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