Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9df38774d8bec0f…

MALICIOUS

PDF

91.7 KB Created: 2021-07-20 16:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 809e1d8bf640e586e1efd056938a34a8 SHA-1: 1f27f2887e247f420ee1442bb8aabca9f20afe36 SHA-256: d9df38774d8bec0fd4d3de037ac90eec8c1938ce4ab14dce6b11a8f37c834552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. 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 analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://tenshinorchids.com/FCKeditor_upload/file/muruzebunuzimazoj.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871543dcc04---ginewetinuzipozaw.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/zavuvuligexe.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/96032332636.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pubaduvutuwekivokanajasax.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046d04fbe8---7668915922.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210616_072232.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160900c736a205---12279747201.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/tluo9l7havnrp0oks1npa7r6vv/84578448216.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbda3a6efc---mafinosuwatusimogute.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/79426446463.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/e5ca8c6afa50dda357914b0ff5ce84c8/56116489022.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abb418c11---1001858518.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/zadafis.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e613742c3bb---folixotok.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/79fe63f2f6ad51072bf5bb3a26113cf9/90467521148.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/saxamajisoxajidumivod.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f15c6e1---60026792410.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5kfndh6tvvos6c75in6gibja0n/kedabebivotabemososukigan.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d86fa565ff849b904e86e0954861f1d8/wedewefefesulos.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/vekanemido.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/61722198700.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xasevazawazuziweni.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/saxeseraki.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/rusames.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e5b82dcc085532d5aa014889f477805e/76251460448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=too+much+dopamine+in+the+brainPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/88b99f65310dc5c127785ca86844655e/jeruwodazonakapunoxoni.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10768 bytes
SHA-256: cc48da8b07dca2eaecf223572e639087802bd129e338dc2b7f6895ba79cc72d1
font_01_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 17104 bytes
SHA-256: 577dd6d46ab970f9a1ca5e7f390878ccb83ec575c1df00fac3db2e07ac816296
font_02_sfnt_off0001496b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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