Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4594d24e77278e…

MALICIOUS

PDF

105.9 KB Created: 2021-10-10 10:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 122e1b2d82dde43cc3e52b2184bf0b2d SHA-1: b4019064c88b54728f53c9ba0a238564bd28a934 SHA-256: fb4594d24e77278ed084070d6777a1a5650030deb2f405376e97637a6f917b9c
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this as a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://bharatdarshan.net/rgroup/ckfinder/userfiles/files/wopuwabumasalisafifi.pdf In PDF document text
    • http://celeb.huh.hu/UserFiles/File/12702126811.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/gogidagatalobodu.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/magezitifowoxox.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/desigapopenakalikug.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/xodivavipubasilasav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b35c4b562---15671074438.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131624f10542---66346239107.pdfIn PDF document text
    • http://regcureguide.com/files/files/58201850660.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614773aa096ce---sulatefakitumema.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/dewib.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/1556889276.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd2b0bffe---71103816546.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/vikojupofabigabusijexid.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e20fdc0053---rowavizat.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/82078534704.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/vujev.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/romujez.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/26321472610.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/48511563732.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/kubodatojom.pdfIn PDF document text
    • http://tayles.com/uploaded/44749837490.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/67314274979.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/siwuma.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/10334552979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=analyzing+business+data+with+excel+pdfPDF 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_off00013285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 20156 bytes
SHA-256: 7acf7ecbb34cfbfdc9ac7f15118e42f0aff0dc84739a7b8779ac67a9205a3dce
font_01_sfnt_off00016709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F20 11264 bytes
SHA-256: 977e0242f2a1b6dbbea7c0b4aa52a722ba3b04198da9aac20e2921bf387c6f58