Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b16afb1812e555c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 20:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbfb28e08242426addfa7552a86a8f5f SHA-1: 2d5feacc3676a16f2f93b4a9508d28f397180916 SHA-256: 0b16afb1812e555c179264f113ba239a1183c5e08ce04cb112ba1069f1b57b7e
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/nuxodixosumirukefuniditit.pdf In PDF document text
    • https://saigonservices.vn/images/uploads/files/57970914892.pdfIn PDF document text
    • http://esejsc.com/upload/files/71198999409.pdfIn PDF document text
    • https://kildevangen.dk/files/jajobafeloxiti.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/71715497717.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210917002806.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/51556817305.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/duleropoxej.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210908092328.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/kusov.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134022cd3db8---17872259192.pdfIn PDF document text
    • https://bor-diing.com/upload/files/litinibe.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312313252107.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b33c0d13a---70592242525.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/nisarejiki.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/72592578689.pdfIn PDF document text
    • http://ijfbn.com/editor_up/numobufokipo.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109140255161988.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/buruvakepuselafuruzuvofol.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/62002267825.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/92800258196.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cc5fc9bc7---giwugazik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+tell+if+phone+is+unlocked+androidPDF 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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 18824 bytes
SHA-256: 3c7acc3447bd0c069fe8084eba418e3200ab625b5c232876b4537dd33b9f86aa
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10988 bytes
SHA-256: 53726804eb8030a01376b9cfc81108422a8b3add09eb790db61a01a650ab686a
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.