Malicious PDF — malware analysis report

Static analysis result for SHA-256 d748db3f4d453274…

MALICIOUS

PDF

57.1 KB Created: 2021-09-16 19:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b9a789e888a2363d67be56b818f8b5c SHA-1: d53dcebe892442a7d7d08b1da798b030cb983442 SHA-256: d748db3f4d45327481c3cc62276edfcdf54424b8458b20da20d02b7a2e888aa8
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

Heuristics 5

  • 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
  • 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://cleartunemonitors.com/ckfinder/userfiles/files/64214636775.pdf In PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/tinaturukamapalaragukus.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/87393566344.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cede3f6a0---zazuwunonedidolal.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/menajasamefozopodunuxo.pdfIn PDF document text
    • http://packturf.fr/files/pivazowufatesiseritowefoz.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jerenozuxatenigejexifab.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/jazijewesopu.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/pexotazu.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/83783639108.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/kabexezomadogov.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/sukamesu.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/timovefuzoxidezudone.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/48289848147.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/51e1ace4c1c321da4022a69d433a40c5/95595921425.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/46340393543.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/venupukipobum.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/44110202223.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/10565012356.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d1b5531dc97e7c4ba46469a9f477d16c/betagoxugabokudasofasoba.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/futukow.pdfIn PDF document text
    • https://t2sc.me/userfiles/42154781586.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xaxosab.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142046f88481---baforizin.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/wolopataxazabirivin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+notification+icon+not+showing+in+status+barPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A0 10884 bytes
SHA-256: cd0cefc89a891156186aed21b56ee454f510e53c52eff589b04586843fc527fe

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