Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4f8478071cb87f…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 02:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bff6f19b3ce640d392007ebccdca7de SHA-1: 22c12f37f03869d424051f238cec9215bd46dedb SHA-256: 3d4f8478071cb87ffe51c183e1d948184c001ef22d5eb9616388f1f375a33173
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbc25dd34886a7a16e8e9dd10ccbe8b2/36271661139.pdf In PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dv0duhp2tj3v82jlcq5859ftn2/10384976710.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/laparipobutelejokexuj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c353a26c4---xixovezikevupalawepit.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/pijatixilulo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090865221264---juzumawadutironubip.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/9281085641.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f256aded---95600367745.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b3cc3a487804ac68767a5f6dbe271ff8/8754583630.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/575e43b4ef2808c289be1978cfe1d220/82361484900.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c12988ef0d---kopuremeg.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/51bb70b43582b8608a430378a792c398/71203783576.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/83563507605.pdfIn PDF document text
    • https://area5srl.it/file/pavetumajugazimos.pdfIn PDF document text
    • http://yuha.be/_files/file/jamap.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d539a066---jivipu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d345e4eb06a---nozap.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/najifepudexevararef.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/5976918015.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/xawemupuvumawisigowos.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/56240708401.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/kibejonosojox.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2dd026df---pudel.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/29852556566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=access+2003+report+to+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_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16652 bytes
SHA-256: b0dc88bffec2a603cfd227a445ac12a7260a50becd0008fc2775922f532a5691
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 10604 bytes
SHA-256: 9ed42a98f2f531fe9d5303817774834407aa613f2126f9107f3e4999c042b367