Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dbf60878a4b375…

MALICIOUS

PDF

118.7 KB Created: 2021-06-17 21:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 167d6493bb8828ec3ef3848b551960a0 SHA-1: e6491510015417b43118c0c2b2f6d2a40d11d69e SHA-256: 11dbf60878a4b375467f206934f39d32bb4c66527f8422a0a4c236d99727f38d
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3d93feee---12480959534.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/dd21d59ba623a9b2f834378267edf0f3/nesifobaramale.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/2044946501.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1lkqnbcl392v4st1mvv50hm8jd/gumegarux.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d65749a8b---73830424452.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a519f2a74ab---riberotopezuxizuroju.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfeb1fdd9---2478982859.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/07ccab1fc1056bad86736d26bbb49b36/6166043082.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30acea157---dugukivupifetaruzubaji.pdfIn PDF document text
    • http://apsons.eu/files/file/74010223593.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/10550420427.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kebekuwan.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9a03a3b419dba2fb0bc87e7df81b8ace/mopizozonukel.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ektos78vp4pr7u6fcpkdleg19p/84701222133.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bf1c1273a---65085245604.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/374ef17de11c43aa9ae44a3f8b4ca26a/fupaxevufibavo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2387664d---77797379409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=smash+ultimate+next+fighterPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1E 10920 bytes
SHA-256: 8c4aab30dd0efa3111a2e861cac95a54d266f02d6803ce085363bdc0ba94baaf
font_01_sfnt_off00017ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF2 5352 bytes
SHA-256: 4ab48cc36416327c56804b451d6dfc1aab15b7c0bb477b5926dc33f413084eae
font_02_sfnt_off000191f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191F6 4892 bytes
SHA-256: 2f2fad1c8edadc527bf86251d87a426ecffcb09c24bf63287b7c35f9888a14ac
font_03_sfnt_off0001a3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3A2 12384 bytes
SHA-256: 0785fbc2df785cc91b1128b5dadf012010451857884b0028f3d8df54a30b20c2