Malicious PDF — malware analysis report

Static analysis result for SHA-256 defb7c293834e8d1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 07:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6c1ba685636a40e77ba9b9d4acc9f56 SHA-1: 68a67122ec4855fd84dd8abd9add39578f648357 SHA-256: defb7c293834e8d1b439d9dccb2d8b68b472145bbcd1027672dc28716c3fee37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic findings indicate the PDF acts as a link farm, pointing to multiple external domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://playoz.com/ckfinder/userfiles/files/kiduter.pdf In PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/98587848155.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/66507985440.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/64248585763.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904193101.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354c1e7833b---sepubusirisoxalirilar.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/bekimodavizimipa.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/70s1l7q0eg66hg8t5m6bhurejk/digele.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613957876ef73---lodobofezofovudi.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905190436328703bgjzjc.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e156716ab---rojixakufov.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fawij.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/70634703172.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/tanumabodixuxalog.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/41428200867.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19675362090.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/betozigijowok.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa521e259---46854817799.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133171282584---33328531492.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/10962634184.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/9756679867.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/xoxijimolozarobu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_0A22BBEAFACD51E5.pdfIn PDF document text
    • http://konberdbio.com/upload/files/loxuv.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/xalumekani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=zenfone+5+android+10+stablePDF 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_off0000bdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 18268 bytes
SHA-256: b86e1cad409fa40368ad0dfcbc6edebd9b4dabbf3670829f31f3f1dfc10e688c
font_02_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10760 bytes
SHA-256: 11b0e050175afdaf03a71cdc9971170c60c49f14ecef62c6a99eb1ade44db569

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