Malicious PDF — malware analysis report

Static analysis result for SHA-256 e921c5e74c5dd64c…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 08:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: e9087a9f80a4a8e23e5d90eca430bee3 SHA-1: 6a0d186b2d5a4fd95ac46a197a387cc26e32b6f0 SHA-256: e921c5e74c5dd64cd517969884ed66bed837b80afb36fc75159ae33d6f301e20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://southport1969.com/clients/861680/File/58610578471.pdf In PDF document text
    • https://polnische-zaune.de/userfiles/file/junuzesaritezusowe.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d255bdfc6aaa5c903017c81f4c99d752/16163693535.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xetamunezewevevodin.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/75439128661.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/19445109749.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb98715c8a---zitidunure.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/29d46c229a87ddf8de2f5ea33aca3184/dadunebagiteropeporitib.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609773f6da477---vugerubogu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/22676653dc7c5a8747fe0f74026f70a3/81057112478.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/81689658572.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/74344525345.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/bekonebigazodudagoxazugub.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/6127341440.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jokelorapagalarulusu.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/12362524169.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd766aaf2---69286302869.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/50199abf0640bb2dff0559d30dd06834/73299130769.pdfIn PDF document text
    • https://2acontractor.it/images/file/74134668403.pdfIn PDF document text
    • https://schmitz.cz/res/file/78400452652.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607055d76f4c8---sugunilu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d83723923---xutusivepubalulir.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/10fa93c702ce343880f18833c4864363/mudazawarexu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d8bbbafe---norodebekadinojut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=abecedario+con+imagenes+para+imprimir+letra+por+letraPDF 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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 10980 bytes
SHA-256: b15dc10964a24f990c2d4d115cf9627ab66b54e4937cc1769a9d8a7b8dfb8204
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 18132 bytes
SHA-256: 4cb85f029a26dd76f463d5b9c727a15d45a08b5e8c7baac1c06d28f814a390df
font_02_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1