Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23cf1b01173e218…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 06:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56f49313d0c7c13e67a61e10dabe4bfd SHA-1: 868172aaeec01ab33f41d5e7a3023034c0c0700d SHA-256: c23cf1b01173e2183494909761699cd5774bc9ccbfde6672ab4af15e7f0a7c64
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e31e0881c---kepaxupa.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aac49c1cf4a---13531652761.pdfIn PDF document text
    • https://t2sc.me/userfiles/madakosexegutewu.pdfIn PDF document text
    • https://ahha.az/userfiles/file/59821791690.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/jatevokoderixobamofojija.pdfIn PDF document text
    • https://nexusmediation.nl/files/negokixag.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fcdebae7c6d3f47d6e4edb1c4e1ea295/96911962069.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/59070336304.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cadc4eee78394157b90f680b8b0013af/93696704124.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ffac9a130490b583f98c8b60cb62e846/56012602383.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/35913738849.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c185a299d192be18215657c603ecb2d3/2023199829.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7na9dp1n6avsj0i931k801v66t/82638808942.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/mivobezoxinamipofopidexu.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/49343722310.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/dozutozoza.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da30dbee02---23026932363.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0936e95875---64358373358.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/fakabefulizuvaburo.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/66204774656.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bogikow.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/temeluxulakisijesekuxewim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+course+of+love+a+novel+pdfPDF 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_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10656 bytes
SHA-256: bc647da8bee1b02c6684f49e5c3ebc9a7d4d16daa71e62dd26a89d98f68a7637
font_02_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 18340 bytes
SHA-256: d7e72798578d49de333dae9620226e33154377a73b205845f077c37a4addb653

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