Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73a9fbb666977e1…

MALICIOUS

PDF

76.4 KB Created: 2021-08-06 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d506acd48b60e98589e8f7bec0346b5 SHA-1: dcca51607feeba1636be020bdf7aa0a07dd31242 SHA-256: b73a9fbb666977e1b0e15f64bb3c16568783ef7f76fcd2e487c0282511cbe40d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://monkey-do.net/userfiles/file/92885022449.pdf In PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70104042857.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/68362980495.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d10e1fe938470071d2798c020ac56d0e/kalupixixajazude.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc252ae41---pozobezewiludo.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/94554342004.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/73821411691.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a04bf559b8aab661e286d520953d8a6f/waril.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/21117397167.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/55709948291.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/b25912c1d4e6835989350c8006a0641e/49293208032.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5334f84c07---teruzesuredokilavanuwoz.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xikamixasuj.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e34cd6ecb873bcb86c3af3e51e44eecd/mijusuzajoxajunuxem.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3084f0a2---digelaligujuxebivukil.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d5a505da0b55f9ebfc7db5eb286e99a1/47789698776.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098670e4772a---zufinogusizemapusa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7j8kms4dloh8tehrc51koakfc/ditagigibubefuvogabax.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/iegman1c23vksm1darc9eeqkhc/34302943001.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/xizuvukox.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/5082603884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=suomen+mestari+4+opettajan+opasPDF 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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 10752 bytes
SHA-256: 569d5bff9f350e6976dc0e4dce965617262cfdbff802391dae71d4e543872dad
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 20620 bytes
SHA-256: bd06083254e1bb01f932474455ed86228c915501f7413eb133d027a537a75280

Open this report in the interactive analyzer, or submit your own file for analysis.