Malicious PDF — malware analysis report

Static analysis result for SHA-256 9510c4bab991274b…

MALICIOUS

PDF

87.5 KB Created: 2021-08-24 07:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4901b5104e2adf55b06c90651ba0c45 SHA-1: 6ab9c7aa8745c8b2b4e67ce25a64c8a9350a828e SHA-256: 9510c4bab991274be12cf85e0b4eabf871e3addcf5055f62dbc5eb0948058afb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages. The numerous URLs extracted from the document body and heuristics confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crysiq.ru/uplcv?utm_term=disc+bulge+with+annular+fissure PDF link annotation
    • http://atomleasing.ru/media/File/tabalobat.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bifavapuzova.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/dapepurorusige.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/i760j5cbm6aqulqu0dqadnabuv/93913491401.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/13820260445.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/64374214190.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/15036214880.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/fibuzimifiripelidibuli.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/u6ahr0rg3f0hf28cbuda5dv1it/zekobug.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609abae98cdb6---mosukujonenug.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/41037815659.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cc81f332---74369180772.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/85160714101.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/tiwotogilupapel.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/velamiro.pdfIn PDF document text
    • http://novichiha.ru/pic/file/palijuk.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/osrotj89jo61aff5btv64f9upn/sajuliraronaxanewa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8023162e---7767793155.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b490429a891---jakezesapamukorinijokozoj.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0l26krd46mk4usort52bboa49d/vulanisifibibotevemem.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4eea5d4d4c---gadofunirexal.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdfe4c7c5---51759461954.pdfIn PDF document text
    • https://panama4d.com/contents//files/kuzukunaw.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef6d9167db---34358341363.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa//files/gunejuzalapezo.pdfIn PDF document text
    • https://soechi.com/userfiles/file/81444211780.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed70da9822---rulegevuzuzogibudiv.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_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 17432 bytes
SHA-256: b2786ebc124e990d6fdf11aa0dcb2b03f4d2339a02614b315730414ac7e8d231
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 10824 bytes
SHA-256: ef1a4bb597625cbdc7f34d5ffa13b18af0eb541e179fb975b05bab0cc9f47495

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