Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f18a6cec2c7cd5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 15:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 72be95a359eac4399c75639e675aab1d SHA-1: 00a80da22589601422c63250cb4ead241492a02c SHA-256: 16f18a6cec2c7cd5d5f170a049a873f5148b7d9b0ccd3612bed9149f1fee4a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/a0octme8h9188f6eqs2e701rt1/90719185869.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc225f21a---60389257929.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/gedevemeluzanatazewinu.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/sonij.pdfIn PDF document text
    • http://dentali.cz/files/files/ronaj.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/ronorixiwedu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137ccd32cf38---barifokute.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/fezoxojomisuvapu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/39170569801.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210911180843.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/kedajofobusalumuma.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/93809184085.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/ranipug.pdfIn PDF document text
    • http://labradory.pl/file/bexadak.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/89771354122.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/25572671637.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613498ed9b288---godofibugulab.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wonumad.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/motuwumobamokisejiwiwego.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/jadomusokal.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a6b0a79c708f7630d001360d3d996177/zesakaxememogiworesul.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/42a4a7.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/9379220477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=echo+dot+setup+iphonePDF 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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10388 bytes
SHA-256: 6c107171f4dde57a45a945511fccb14acb3a18da426a57c13ee461749c647d18
font_02_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 17560 bytes
SHA-256: c13c4858edb0c99a96bb32f6f6026ef3562d1cf56e6f6cb4927f9d554c799e14