Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672d875cd2b04d1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 11:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83902ecdd0fbdb7557d1d4e886557158 SHA-1: 8a4251552816d3a4396f999b92e3f9893b6a765a SHA-256: 7672d875cd2b04d149995187dad4c928878836a52d49cb7e581085f34c4c738e
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. This suggests the document is designed to lure users to external, potentially malicious, content. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8004

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://gtselect.fr/ckfinder/userfiles/files/57378308964.pdf In PDF document text
    • https://thefencedocumentary.com/adminfiles/file/dogazajokimabafemat.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160772a8237740---tibaz.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gexuvogogiwifu.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/62837073580.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9a42eb526---kuvajibokizedum.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/85125587041.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e563e4d297---62251883559.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/38848054685.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kapiwe.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mo0m6ss9890va6qk5jc5eeagco/davevujar.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/11041771322.pdfIn PDF document text
    • http://dgjst.com/upfile/file/vukixer.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/74603253277.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098960f75dfc---57622688299.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429023249297919.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f00db96ee---wojowumawuzekoj.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/tafowidalorelarobotex.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a079f80b3ae5a3e21ade34782f991935/7301420341.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kutojatonabipu.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/51055956697.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84b4e6aef2---foxudipumajoru.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5740909822e1bfc19f0ec3357e737dc4/xedig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=patellofemoral+pain+exercises+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 18068 bytes
SHA-256: dac6765e44690e440aec1894f193ebe2bbeab3682f30a84f97bc6d44d6f42a7e
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10884 bytes
SHA-256: bac13a4f5baaf94228158715037758a54225999c25eafe41c44264ad7054fac8
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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