Malicious PDF — malware analysis report

Static analysis result for SHA-256 2177a5f9cc01ee4d…

MALICIOUS

PDF

74.9 KB Created: 2021-04-29 03:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b11775d1c7a493bcbe44d0c4eb6d1c40 SHA-1: 92f2dd392334853306f3216c73882aa5eb0a2024 SHA-256: 2177a5f9cc01ee4d64f972ebab4f31e97b6c1c5e85829703b4b1ab45d3b6b2d3
94 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The ML classifier also flagged it as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8080

Heuristics 4

  • 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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/db421147af8041fcf743ffba50ddd144/sojidegujoritunapelugax.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6296e21b---87531508010.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/66624016c2b840770a780e3bd6feec73/68233457191.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608564ec3f5df---dosalulajusavizi.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9eaf36106c40e9433df16d8c49b0e355/33840118491.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/qu3v991r6ri7b1sblejdghpbqc/49548151494.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a397dfeb1---50624982046.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d903a2562---xusiminugi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f609a260900a5fb18fc8152ac0382970/vezekudajanufepogi.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nv2kp1hdmu4jtbrdoigh5na852/tisam.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071d077b0ac9---rajesigewijopajuxebusur.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a171e211---ronoxizuzulozimidowimanud.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5cj1jc8tc3a0eqvi8tpu9a4rfr/laperanijazexit.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/da6d87eee201ab1dfea9b50e4892573a/fowogejol.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5no5a147pdvprsbd85bdbnlivb/ragim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cisco+ccna+filetype+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010776.bin
bbd598544ace3d6d3e56bcfd01fc6511f76e3b97b2793615bc37cc611a7bf755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 5060 bytes
font_01_sfnt_off000118c6.bin
42becf84cfef3af2050d5e7c266acbaeddd1a8cb4cf1814aa6fc565b5bd0bcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 1872 bytes

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