Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10fbc3eada4a2a3…

MALICIOUS

PDF

100.9 KB Created: 2021-07-25 22:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f354ebf779db5e6dfafcba2d92f91f94 SHA-1: 9b8655a2c5549e8921f35699e71676e1994fdb0e SHA-256: c10fbc3eada4a2a386ef8e1b5a9af25c0bc6d59a25da46bfc416a350fa4addd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikuma-car.com/js/upload/files/77727276180.pdf In PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p5qcjdslctangakghnihig36j7/figijozam.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/357f0f9f0042900434a0c529ff7b4997/89924949802.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/84240985800.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f9dce66b4a5---jomexozutevoti.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d207d2e9f50---84397362256.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c8af80f36507cc328f9b991542dabb5f/gekitarikufawamixoj.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1fb4c19b---kusonipojovimava.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/92855672785.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/biboxibabusefag.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfjoqoq66fvp3ehffcbcgaarn7/rofiwik.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/1225538734.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hu4fcbjdp3j967kmec2q29pt8b/pejugofosisa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/63902596875.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/medodede.pdfIn PDF document text
    • http://geose.ru/userfiles/file/wigovaxumogo.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee14e2a42---45876233840.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d90584cc691---rexedewupetebabigovob.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb97742e0---38247847118.pdfIn PDF document text
    • https://aedwea.com/upload/foto/53222818389.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5ca474c5320f13741f412c48dda5117e/sodalaled.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17163584489.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/eidtcq21a2dpihmlrrg4g1i5eg/53192808121.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784bf7584d3---zoloxi.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/xuwedoduwivateja.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/tapewonarugodadoridet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rainbow+vacuum+parts+diagramPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 17688 bytes
SHA-256: 290967fdc0da479dfb2af63fdd6413d58873eac67d267f034a4098b4ecb52315
font_03_sfnt_off00015d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0B 11116 bytes
SHA-256: f3aecaed3567cf787dfd402afa5e1d47866c17a97c98c69656c930f9c85b14ef
font_04_sfnt_off00017694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17694 3476 bytes
SHA-256: 4b970b02f0ded01e6f3f6fa5661b50550040cc5fe3deedb873fafc1b015402b3

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