Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d4493f4561af1d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 23:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f7260979149c93feaccacc09e861f87 SHA-1: 4bcc6051f8345ca4b6f9b450bf163030636f2d8e SHA-256: c4d4493f4561af1d2909981604339584a5f8f49dde99c0cc206099f1fc159eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=pro+shot+apk PDF link annotation
    • https://at1apigroup3.com/contents/files/tosulosi.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909094913887941mfdls.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/60544112412.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/70081928983.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/10480174649.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/78328762829.pdfIn PDF document text
    • http://waypl.pl/upload/File/jewiwela.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06324c2bf---minoronod.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8531034d0888da2bb9386306ad4f46f0/sananofuruborumodudow.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/mekizoburorumex.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/4292253580.pdfIn PDF document text
    • https://swiz.eu/files/editor/widokib.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cc24ffac9d199626e0a2c7bf199ee8a8/pajutesutavula.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nularadovosinoloz.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/8444324818.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/folirigasowukagavujuvata.pdfIn PDF document text
    • http://cpils.com/userfiles/file/9902308514.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/zegibelipiviwedosutejidos.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/vepome.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d2c93627---57861870200.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/87747532393.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613489f5e5340---66538973291.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 18788 bytes
SHA-256: b475c897b2fdb7ff5e0dbfc8d3243d6de16a5a21acd225cb314850bf128da8ef
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10068 bytes
SHA-256: 793f166d707e9e66d7a64ae232bab936708b365a3990e95991fa98eee2a915ce
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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