Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db6d8c801e31127…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 22:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 7be18be8db59977430cebb3279755b4d SHA-1: 42f1045b794a0858a3aff2a0561ff24f4b619363 SHA-256: 4db6d8c801e31127ea5fe4efd536051394862166bdf4f775f5616cb42f96507f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are characteristic of a lure document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dblhs3ja2jdf4iqc4jpjrie2oi/sudifadezakubuvozukajo.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/p4aj2ug646fnbiroo8vvupjlk1/91546166599.pdfIn PDF document text
    • http://akademibt.com/resimler/files/3656328807.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/68282640384.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5c61275f---96966765769.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091106bd57db---nitud.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b6f610a9b076ef16589f686ea9ac0b4d/lofadumozebetizekox.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096d7aad3e51---xodopanivelu.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/27328187651.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/85427116919.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/11225044454.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a47cd85c5b3---rokelisegumuv.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608858b75f2e5---zogokemugizur.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aacd9e82aa---keliduledafoxugazemojot.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa760ad5a4---zufewum.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/47pkglpa59mu4jii19v533nko1/vapenezuv.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/xadoxabidakalapejiwofumo.pdfIn PDF document text
    • https://pellevah.com/upload/files/49455777105.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa8a14272---baxoz.pdfIn PDF document text
    • https://argumentua.com/i/file/83965758857.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/934b466ef5e1ac0a9b8948e8f6f1e973/xivexofem.pdfIn PDF document text
    • http://pypconsultores.mx/userfiles/file/61168450881.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/nobupive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=les+baricades+misterieuses+couperinPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10824 bytes
SHA-256: 22de5c6a804f305ac3b5ce26ac0df4acc97fa6e40991be42aa6e63ea73451a10
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 19896 bytes
SHA-256: 77db87be95b1ab715c622545dcd2cfbe3042f2a947b9ea468efafa4ee52788a9
font_02_sfnt_off000136da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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