Malicious PDF — malware analysis report

Static analysis result for SHA-256 48dddee0fd62646a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 04:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6f139e478046e311585803bdf3ec9ba SHA-1: 9460340db11ac323ba4051674c6c97fe0547e751 SHA-256: 48dddee0fd62646a83fa55f6b577cb3e0458a4f63df6793fb0bef4efd738c89d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to obscure the true destination of the links. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://hospvetcentral.pt/site/upload/file/nadatomaxanaju.pdf In PDF document text
    • http://hyosangjo.com/userfiles/file/20210719024529.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/70591725140.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/xukototomonudi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b5867414f22---34534503656.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161277f48a31ef---newedafufowifopawal.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/80443554488.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/38198988353.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2274431376---81406204992.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/81019693845.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc76f2d13---refawidazesuvuwobigadu.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/wajidagijaromiwizuji.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/18644261215.pdfIn PDF document text
    • https://orangerun.re/photo/files/fagepeluwigizofolon.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/fuxudaxijuganazawute.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/popasetusosujojuzul.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/14676151066.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/giwelasidusivotawurerino.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9902c158d---34106023853.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba058f9f446---18262864053.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/77ec3ae61b8aa984b35f5e95dd4f836a/sodorisa.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/22891507833.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/32f2f64fc0e2e27721f37880a4432ca9/korenagiriwusedegifazeso.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/58241777654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=car+coloring+pages+onlinePDF 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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10484 bytes
SHA-256: d10e3d5f762e0bd03ab307f012ff983cb7c34647e25a2cd940a55f7382c3ebb1
font_02_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 17416 bytes
SHA-256: 3706fb7a6041631690bf24b09ce3ac528c60b397477e1656703c8cfcc9aae0d9

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