Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca6ca1daee29491…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 01:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 122bc28089d0b602c71ea95b548a133c SHA-1: bde48648fa8569506837130f95cab1f8f84d38ae SHA-256: 0ca6ca1daee29491b19b48202676b8758ba97e8af7560343e82fd59ecc5ef5c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest a phishing or trojan payload delivery. The embedded JavaScript likely facilitates the redirection or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://krisoc.ru/uplcv?utm_term=blue+store+apk PDF link annotation
    • https://parfumzone.ro/files/file/vopegoxaja.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/60416591376.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/tenejagoduzogonu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2029d5c3---63631073247.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/58515036112.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21091312174565451999vw8w.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/90343177764.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/27065843939.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/raputoxenafepuzobufo.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/11468288271.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ec56072e---jefeto.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/vewogekokaxetilexubi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/84416151174.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wowulogolevalogozituvab.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161329a370c16f---13229846584.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/7310269995.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146565f18218---69593319518.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/683965680bab7fafbd4b83093498004f/66770858314.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b06930103abd17ff1f24164f1fbe877f/38672423361.pdfIn PDF document text
    • http://apple888.vn/luutru/files/22341485895.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202193_33133_289.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xogowewojevidasefojuga.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wewitibamijukofololubo.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/wemejavapepo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/50631922991.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///31853368350.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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 16552 bytes
SHA-256: 629d47a820f1479452cb05e487abf0abf3032dd331b3411e3b3d0f56190f1ec8
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 10292 bytes
SHA-256: 49f9ca5e18748988ddfecf44bccc35baef88316d854fcb533a4a3cd3842e0ac8

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