Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf4597126064161…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 07:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5653917ee03aeb8cf006569f83c0074 SHA-1: 3fb70143ca1d9da6ca7e0aa8e41b72c00e5b7ebb SHA-256: 3cf4597126064161a9655d3253e2974cc441fdd1f431ad44933f0cda4d3cf542
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=hide+online+mod+menu+apk PDF link annotation
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kolitisesafadebewib.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/bawuvojetupapolakazetiba.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613613c842c59---80071160296.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sigiranejevefadixivom.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/89046877673.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ea4551f4---20847188100.pdfIn PDF document text
    • http://parentini.it/userfiles/files/motala.pdfIn PDF document text
    • https://dalba.net/other_files/File/30221998792.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kiruwixadonuvonemif.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lizufoki.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/komufopepez.pdfIn PDF document text
    • http://k1a.ru/images/files/file/forar.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/webukakobavudusemog.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/99558960912.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/peninepejipegafavugejobiv.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/98476432279.pdfIn PDF document text
    • http://reopen911.info/media/file/1100521730.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/35529924339.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10f544262---gonubedakopazazunerifida.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/zonavusuf.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/070052157411.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/t999e1rm5mrsk5sban207ofug4/kobuwudalufuwisew.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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 10372 bytes
SHA-256: fdd358c20b276d4b58d324cc26373c8acd8b0dbeeaf3a23b042fefc51e01968c
font_01_sfnt_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 15176 bytes
SHA-256: b522b755707e0bbf61e337f699db6eeea3982a12683d2319afd38787a2bc9c57
font_02_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1