Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8d02f0dda1e557…

MALICIOUS

PDF

69.0 KB Created: 2021-09-21 05:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2962c42c7caad6f3ec01147786a40da1 SHA-1: b6d298162de537af9e723ff406bf2b1e96e8ba69 SHA-256: 8a8d02f0dda1e5570d2a6f54e22230bf7dba97d32194ceb22ee5b3a60a68b97c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely lead to further malicious content or phishing attempts, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210902202620.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141abd974e29---fomudewen.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bebadagal.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/50892391912.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/51413627248.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///fakodudaluwadupuju.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea5d81420---92336601595.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/20995546362.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614871414c7f6---54577001388.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/xuziwibedatuki.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/gexegowozonewovusud.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/17897281174.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff130d89e---wosurexetupizerus.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/16468254538.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/mazixatizasitigeg.pdfIn PDF document text
    • https://toocapen.com/files/6866494761.pdfIn PDF document text
    • http://vswet.ru/f/60272054599.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c738c9198---xupixexemeweluxetuxeva.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/60190323593.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146712e34110---xexogemosiroregatiri.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99db9ed16---8240221379.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/xarirenajorowirodukipuz.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/64345903600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=swift+streamz+smart+tvPDF 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_off0000b282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 14496 bytes
SHA-256: cd43fc91cee92334e33e39534a40c9d2c9e6d6360ebb63dc26356bb4f0d84463
font_01_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10392 bytes
SHA-256: 1199412fd714f219cd11df45dd30ec4a16483384d682c1e6520ff4ca6af66cfe

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