Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660ee1734d007a3…

MALICIOUS

PDF

71.6 KB Created: 2021-06-09 10:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 136e9b46041cfa7e1d23305a463a9c05 SHA-1: 2fae6e7a00d1b2457597df2a48872f1c8ac6aaf3 SHA-256: a660ee1734d007a395794f456b50a02f55f854a4e547b48c7ffc60d37c4af90a
196 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. It uses a password-protected-archive lure. 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=mobile+app+wireframe+template+free+download PDF link annotation
    • https://blindnow.com/userfiles/file/rofegopisip.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e66b0776b0915bd04a526bc9275b5f66/95177150276.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/8164141363.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6266d8107c1139568aff8c8ac49fc3df/redefovetubewasobevefor.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/wixuvipewunej.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074313129941---59543032180.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mitenukolenafawabuguz.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/51053126831.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/funole.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/fuzikofutisekemofo.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/tapaxizexipu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/potopirosak.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b1e69c2a7a0f72618d99cf0b6032d5b2/totamiselavi.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/debeseditunudirami.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b5753aff0cbac2517de2b4ec78e35d09/farasawiruv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 5244 bytes
SHA-256: b889c4612d89eb3f9e4a83274d2f2d1a159a653fa11e262e371431ef5e2c8070
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 11280 bytes
SHA-256: ed6727090265db7071db20e267394b8087608586bc7e68f817303c63de29bf7b

Open this report in the interactive analyzer, or submit your own file for analysis.