Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e2121488a98a0f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 07:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 235937eb1bce23b16b24432d10bca949 SHA-1: f047aa6140c3d73c37dbec038554ad3aff845a5a SHA-256: b1e2121488a98a0f28900de4a91b0c72139c16799d0a6c7aaa34bfc8bb1b5ca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely using embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yanartextil.com/firma/files/fabaz.pdf In PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/43211899670.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/tasofer.pdfIn PDF document text
    • http://handypipe.com/upload/godimivalibefelenuw.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be525b55f---jeviwido.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02b19ce20d---fowumesuwesexanuku.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c01769a54d5---judisekepulul.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/72696137025.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/musovefekusoj.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/fajetomesuve.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6dll9t9kn7aq3gs1jl4mioukq3/21891944058.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7692c6c6cc5ef0756594002fbf73afeb/pexuvejumilomawipof.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5598447099026b355c61f3f080a61baf/73501050761.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609658f3f2aca---19648644743.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/73201574812.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29b0b18ac---nasibap.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/13326237540.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/35633206031.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c6955194f54---xedujoki.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9bf76779---26670044764.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/segexupugutufox.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e855cd4---zisepatilaturoxo.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/detuxubiduborafezezarak.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/xuzugupe.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62609695---12419014178.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/57588380939.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/puxitegodudowesugo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0c93a508d9b1debfbf3965e102e60dc8/12452201147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=foundation+phase+maths+worksheetsPDF 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_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 10868 bytes
SHA-256: 7eb0b3b607f0c44990d613375ea94e1dd82264bafc64ebf678c437e019ee6c03
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 20076 bytes
SHA-256: 3cd849373a8b7f532cb7b4f2251e1cc43fe738846d2ee08de95c31b23b514605

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