Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f428f1b77e605a9…

MALICIOUS

PDF

79.1 KB Created: 2021-08-22 01:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef4c17f3ee92af4b153e2c5f5e594d92 SHA-1: 115e1b12d98b6213dc99c3650484f25101004d5b SHA-256: 5f428f1b77e605a988212bfd1ebd6367548e58aa003aeef328aa47e537dae419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the use of malicious links within the document. No scripts were extracted, limiting the analysis to the document structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55ccf269f---2513503349.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094bca8f0857---puzamogafezupiliginuwelis.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f7479f41---33635594994.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/17262585851.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9bcfc2d4171c968e3f676f53e9df57f2/senitemi.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/74425818858.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/63498087256.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/95835921500.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c777d0e3e41---692649580.pdfIn PDF document text
    • http://fittbikese.hu/files/file/texevizolulapagidodivifil.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0319d90c3a---filebo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/woregijuvuputiru.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/537b5304bd34052690be3ab395ae94a0/sonoradakaxexiboto.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/764d7158d2375211ca67f97cb1c1d76b/71678651071.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/bawumasuwigizavile.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/kakorizejaf.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/vomojifewetis.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861606a37e7---xomomuto.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo4g08lkf11qf8hvqje581ige8/dozenonisezalewedinuv.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tc1paud6fg5r4au11vntg0pop2/xaxukoduxuwodatesufop.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/398b552e92d77ef0edd695b1b69d4742/wurilezigaf.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1059784db---22111553792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=unit+9+stoichiometry+test+answersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/71736446015.pdfIn PDF document text
    • 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_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16616 bytes
SHA-256: ba54c9351a065d8f8f9f57d74d61271185d7e502bfead6691ee9b27230db91c9
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10824 bytes
SHA-256: bb1e4151f73d859d45ded3162fad45a482c302f5ca718c4386bbac8c69d69702
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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