Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2476d27ae767f56…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 10:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2bbf7c1cee5b2b5a08d4efa51fc658a SHA-1: bac7ba21c6d81eddf1fca9a4be07f92f1e7d83c9 SHA-256: b2476d27ae767f564c676bff9d06589d21560c5d171eccddfdcac8291d30eed7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using compromised web infrastructure for hosting malicious files. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vetusmeter.com/images/upload/File/59242154991.pdf In PDF document text
    • http://wowbond.com/upload/Fckeditor/file/42314849631.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149959c9fc37---gizak.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/jewejasokejadevowejijavi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614060e9cdd2d---21058597378.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906220101.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/91790633801.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/19325981848.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/70788458374.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/96896883101.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/sijifegigavo.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/bipipedaruluxa.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161462ee7f3b42---86987968589.pdfIn PDF document text
    • https://novsport.com/content/File/16155939147.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/kabojupirexo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614949e9276da---vimolubum.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/tenizosebuxawajume.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/lifufafetaxodobafe.pdfIn PDF document text
    • http://apicn.net/upload/files/sovozifugutu.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/kubije.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/kedovexizajixelok.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/nufenixowiwisegati.pdfIn PDF document text
    • http://qdjshg.com/files/file/41459924541.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161406818b0d7d---lizev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+hide+gallery+vault+appPDF 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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 18512 bytes
SHA-256: a9c41213c560dae63d61aa3fbf6631b8fa9019abb961e6bd565899a45748905e
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 10756 bytes
SHA-256: 33f41be4ba0573e47b9a16f1242d67ba6c5e1fb8fb610741958d5c294af244aa
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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