Malicious PDF — malware analysis report

Static analysis result for SHA-256 17955bfc4396e710…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 15:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3a0aaf3b7d71728288a67bf0b33c58b0 SHA-1: b78448cab557e7991ac26986b5033336a4cadee4 SHA-256: 17955bfc4396e710a2bdcd8c16140714fa3664e75817c81b0cd51b101c99f758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm likely used for SEO poisoning or to host phishing content. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ff55d075acb26f2d82f6bf1a9b7bfc4/ravivuzorofakoxuwizexo.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/onsieui4u6ihkjk864k0j57655/20086101288.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae8e3d834---sufixesimog.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7q4r7ciitu0sielu9jc804dahk/27017953782.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/7756435393.pdfIn PDF document text
    • https://fallsplat.se/file/lurovedomuzofozu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68aa053dc8---12772781152.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a09d2de127eb050863d7984daa95d3c4/gogudomeg.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/342b2ed58705a0075fd9297ab96fa91a/85748996216.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/pijeganepe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160871c16d2fa7---22991363697.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3ffae7c3---tanirarifadux.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4cd595a6---fefuzaletemere.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/luvezisetavijoninijip.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c7f5bd5671ddf902d36b9d2475616858/19871709922.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96348190c---tevuzogebanimigifonezef.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094b84b93007---86683685773.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/8f32331b22a0d2dbebebfdc4bee7a46e/bebibimodifu.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/93058539053.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d3f668fff9d9e25b37acf46ab457f513/tusopikavini.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9bb5e9c7640f0c4a69dd04395418ead1/22596807877.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1b0e075a73803b1eca93c3eb4b090a87/33538272326.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zetubatunazoledirukogi.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/zimizipazopogetoritobuvaj.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/26640a8c4c7bf89bbeb5f78d15c76560/79080167363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=128+cm+to+inchesPDF 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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 17196 bytes
SHA-256: 79de6bad5c1222c8e7989d7a53c10e1010801c99c42e4c2887772a78b14be4e4
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10472 bytes
SHA-256: 3223edaa0204c6577f67fd62f1a2f56524b46f7880ddf2c3018eb08ebc950445
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1