Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00d47c941167cbd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 02:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7117adae85722c3d04db65b9de44438 SHA-1: 0346f35d04c85319746ed1b5236f95cd891f9fa9 SHA-256: c00d47c941167cbdf59b6ceaf08598ba6cb89c81aebd9e71aa0bae63563c77f3
164 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 delivering malicious content. Several heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://occahomesearch.com/userfiles/files/rifebubelepixezivifebigo.pdf In PDF document text
    • http://sns.hu/_user/file/vivifimexezefasevemefeb.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/upemiobbbv00lvg6u4ingfg0qp/rixelujozosezamo.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1622634808.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2abc4c14ebbf6c9caccfbad80e36ec77/47524088796.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rorofojobeguravema.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7b8138364---ruvogiti.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/mizinuguwewemi.pdfIn PDF document text
    • http://allycatering.com/userfiles/78097647726.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sjkns27pp21rld2a8kgapmh5uv/nivez.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/namuwerukaginemax.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/wijijugin.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/bixegatisidavopoxar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cca3f8c09bf---ruwogiveketosarez.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/17696496016.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///6461440743.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/40209111288.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609237abdfbd0---32968461649.pdfIn PDF document text
    • https://koratspring.com/upload/file/79112639459.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/bawokoniperavadasakemuro.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/91229135292.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tg5ne4kuf1pnob5g5n49pu2s85/bevirukaterotonabiwuvoxe.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/bawogifajopo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/than8amp8a2csrhaq589hgk4m2/jaxogeviw.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/lomasepiraxokerufakivo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/50236315946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=upper+limb+muscles+pdfPDF 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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 17468 bytes
SHA-256: 1310f91359c17c29a29afa4302606722ac9cc8cbcddefedb0b1a329d173c055f
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 10544 bytes
SHA-256: 141327f693fe07c6b154eada4cb6d0273957084e704b3586ac2568cae03ca027

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