Malicious PDF — malware analysis report

Static analysis result for SHA-256 707bca2292d016be…

MALICIOUS

PDF

90.0 KB Created: 2021-09-20 19:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13d999b4a1665c477208d825d961d4e5 SHA-1: ed775ce4dd8cc5697b91edac6bb844e7a4faef15 SHA-256: 707bca2292d016bed2ada40baf5ce42745c8cd8d5692897b635c19c6357e6827
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through deceptive links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vector-food.pl/userfiles/file/82377246345.pdf In PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909195148.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/pirezopi.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kefezoravibet.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/68580644051.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906002657988696.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/13833906285.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b51de1f97---22641438735.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210916093756.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/dujunedijukabejewavepaj.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/90390621367.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613008dc1d9ab---busuzifibelobasulonij.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sovelonafu.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8323179976.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/niwel.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e2fae2f2---borabaviwile.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nunonekaxo.pdfIn PDF document text
    • http://lulanjina.net/upload/files/77040784450.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lipuvivusomewu.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/masixinunadiwererifixuxo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614465ec8f9b0---2400081120.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1rjo7hvnfbrbij50qvprb5nrb1/54250764966.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/35662303322.pdfIn PDF document text
    • http://machin.kr/userData/board/file/57787059178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+house+arrest+of+us+full+movie+free+watchPDF 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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 17680 bytes
SHA-256: 43ffaf129a51a9ff2be1390f0d9894c17c11f1ba8695dd7c717555962f14832f
font_01_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 10712 bytes
SHA-256: 54c645a5eb7ce07a5e52183d2ad359b683368b29ff8cd9e33526382e331dbd7e
font_02_sfnt_off00014200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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