Malicious PDF — malware analysis report

Static analysis result for SHA-256 d167421bf9e542de…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 15:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0d07a1ca89af717885252a8fa496ef9 SHA-1: ad310f2ca85b994691e7a72f05974bd2637e2eed SHA-256: d167421bf9e542de352571c3d6966765ccdb849e5e5a2e57c4e5e56400279ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly suggest this PDF is part of a campaign to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://silky.ae/images/bulk_images/files/jajubugafamolafemululo.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7f17040a9896c390a629ae61dde2199d/novobudesotojoxazikig.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/45162085725.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/lobebufobixanajutakota.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/penigofimaka.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/90644008686.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/78005504568.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5f6322c1eea99d55b3cc71bf580be1b3/91110746042.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/sutapopugodiru.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/37181238309.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390afe8d2f5---didamebotaxonewupej.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/54508790737.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210912_6401C0124148EFC0.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/tubidolenu.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/munusirijebezuf.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/96351612472.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/gufilazumumel.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/gogafugibope.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/74068665142.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8372acb4d---podofuroje.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xanutaxezata.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/migewojoligekobux.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/lazewelidutinakadanetuvip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+flipkart+app+for+android+latest+versionPDF 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_off0000b5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DA 16648 bytes
SHA-256: 508261873b6955a2136ec8de8be09e7c986a06b2b353dfe8d5ba7d7c76f237cb
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 10736 bytes
SHA-256: 6afcd922ec681828f9119e327b3f993ec6b82ddecd15de2ccb55bac5d89ed150
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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