Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f47b2e8ac02cb5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 16:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 162ffbb84057bb452689e21404096ad3 SHA-1: 4a2161c6e5801ac3f8baa41f6cf602b0fa70514f SHA-256: 78f47b2e8ac02cb5748f79c077c3b9bc4602400d5a9eaf79c4494d2270487146
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm, with several URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further malware or phishing content. The presence of a 'download button' lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/44024466212.pdf In PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/53126055599.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xukorupusawimazesepu.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/80653318815.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/25950051088.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/76379701314.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b40e4964---91742030639.pdfIn PDF document text
    • https://jjpremiers.com/files/19627106886.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/sudozogutut.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/waruwaguzapibetum.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/dogeturig.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/kozegitosuvopoloto.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/7621071353.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jubogewosoxavapagisul.pdfIn PDF document text
    • http://agrion.org/upload/fichier/reritemodatisidewuvoza.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/97719282033.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p4o8eb9fq1dehekslams60kopm/10576531588.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/pizepofedudewevatijo.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/burusuvigijaw.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/gidiletitirerim.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/turivozolibitunatijo.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/31167920039.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161444e27d4f1c---22695582513.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/gukoziluforutivuvis.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdaa87997---mobaxuxob.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/40159656940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=slime+rancher+descargar+androidPDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 17480 bytes
SHA-256: d86c5bb235e7b547d7c18e1564da46dd217d0b26ae807ec5f3528f257c5c3d95
font_01_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 10796 bytes
SHA-256: 275766e5dbbfd2cf4818c30140ab6e855ae955c5575c4974ac7a21ccabd50482
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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