Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ceaad8e902657b…

MALICIOUS

PDF

65.5 KB Created: 2021-06-18 02:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c126893b8aa08425285e374592366126 SHA-1: 213668884275c85bbbaea197e60c1d3243638c39 SHA-256: e1ceaad8e902657b29b38320e4d5c13af7653207d2a007cacb905b3dcfecabb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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://allytemp.ru/uplcv?utm_term=super+godzilla+rom PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46bea4ede9---xadopaxoxi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zawis.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dedda9fcb---filiru.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e45705be17eaf46768dbf2825fcb7449/navunelugi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160943f4b4a4a7---97034328170.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/57252387223.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/fewidajumilu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5chffmabla87bgtn4ls6v3ffbn/xulux.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/i760j5cbm6aqulqu0dqadnabuv/93913491401.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/sipoxixitulutegi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c38fa9efaa9619f937cf88aab0fb5c0a/1167016113.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/695970dd177631d0313dac291cd7093d/65852475795.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ljvpd99cgr4qedfv2qhk67515d/runodulugemirowiniz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a81125087fb---22023015505.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/32886739339.pdfIn PDF document text
    • http://www.celso.org/download/pajawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 5256 bytes
SHA-256: 89ddb80f34d18d6d19f43b4f35f6de04a8042bc615f00f0a0d0da8c533261141
font_01_sfnt_off0000c21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21A 9880 bytes
SHA-256: 8c65348cd6afe9de74e384d3ee8eff5cbf02ddc79803f01567a2f19b634d0585
font_02_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2