Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2009ddad81da51…

MALICIOUS

PDF

79.9 KB Created: 2021-07-04 00:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1176bb028df03a95bb1cef4d063c81c4 SHA-1: 291044905c9618d8ff4953289f3461617f6866d8 SHA-256: 1e2009ddad81da51e2439edb71080dcb03156340af21b0e2d23c0642465eefb3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and several heuristics identified it as a link farm on disposable or compromised hosting. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84ad7595539b034f4151fb85dbd9833e/vejasofatofuwalekizofafag.pdf In PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0a78197a3eda3ce932328879cf140347/40623727755.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/iuur6hob06l4rvqj4hjdkvp5ur/xosimabopam.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076da960894a---narada.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc260c866---suxenakegatizapurevogazap.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5823e8383badeb08df835693946ef467/34755595360.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d063b1cb---80497032419.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080147b4af00---goxawagedeker.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/4748107438.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ab274f14c190b47946f1a5e5d99ecebe/pujivonofuja.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/525c89f44914f858aa8e930eae9d7010/linomumoze.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/73703b9aa003940f44e797ed0e76aa16/98970129563.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/19615416266.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/vomawafamewe.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/9724194081.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6fc9838e91a015ae479b578a84ab6212/11819048301.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3106f803---xezulu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/22457068064.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/93162578089.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/koxadajisowadufijupa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be91198ca3f---zanawikej.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa775ba30---44508335766.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ae43b73bfb042bebc58f38566421f0d3/68749664194.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tuzitoxod.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/depafuzofarekisiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+set+up+digital+signature+in+pdf+xchange+editorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 11176 bytes
SHA-256: d943a02e2a38c7ff93f9c69035644415f8c004140bcb59514a2604e4b11a0c03
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16820 bytes
SHA-256: c8e1952e5476377462fd81baaa2f0595786d44584bb8e92fffb8343d5c8cd134