Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d01cebb3a75eab…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 00:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cc6f11fc1517b82ba89cebcc48b24e3 SHA-1: 310139f2f2ae025ca0c34cbf37dd1b324b816a2a SHA-256: 93d01cebb3a75eab996903a5d014451f4d895199d0d8a344cdc5dfb9d553e460
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to external sites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://editions-tlp.fr/ckfinder/userfiles/files/newezipakazidulusox.pdf In PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/56233247396.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdba13a24be---fupigavafozasenozer.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/nufanevefutaketakulume.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/vozijaxovadi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/radigizelob.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/valozozidogujedegodafu.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///74549493842.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jukulukupi.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/64936704109.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/totegodoribif.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/68495256948.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06aca704f---78768809325.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/42394828146.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f81b7cb6---76278011423.pdfIn PDF document text
    • https://bauarch.bg/files/45127140485.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/91938908809.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210707022943_o9uwgz.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/28002141318.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c34b5e8a4c8055676c63948153e445c7/70436667093.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/20977302748.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/tinutemomu.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/sabalo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7cb98f3ab202f572360b226d50648c84/vowufolobaluw.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/werarunodixofizom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=taking+back+finding+haley+full+movie+123PDF 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_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 17632 bytes
SHA-256: e01148024e9859a5f4a52bf89c2e633ec0048d58ed5b60c8d68a29b08295169a
font_01_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C4 11376 bytes
SHA-256: 1277baaec9e53440426d6b21dbe6c940c5c007c12c6e5a1f627e0ca944bb29fd

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