Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9a8dc7e4999341…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 16:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e370495aa1ef5211edbbc8392eb2818c SHA-1: 0c331f65a50d1ad5721cd09c356ccdec2c6ca7f7 SHA-256: 5c9a8dc7e499934170b5d169482b170748bef0d997499ecb630df91b631faad8
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous links suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5561

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://jagamimpi.info/contents/files/majajenemarekazexomo.pdf In PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33154839632.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/livatijopimigas.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/fatelowalisinepa.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dikodez.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141432243e58---tupowusawuguvitomiba.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/nunazulepowisawasevag.pdfIn PDF document text
    • http://tercovci.cz/files/file/junuduxozajezugilubogeb.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/jinuronegobibudumasor.pdfIn PDF document text
    • http://lex.tj/img/file/7336366119.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/59014915661.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0de53a7ef---lotuzonaxow.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9e87f966641a9c4d7316221effff575e/devam.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915063524700596vpnphgm2omal.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/34715996426.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/84126823955.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/44299534032.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2910bb4259477252fe87618b3ca4a8ee/kixetejoxezamivitofemuvet.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357ce9cf6fd---48770440287.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/51394194184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=photo+editor+pro+for+pcPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/3280608949.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 10236 bytes
SHA-256: 0463eb56cc97ad61c6d01f8eca15fd6994b711dc83d44f30feee91e2f9282763
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 18184 bytes
SHA-256: 3ed54dea1cc9064b2de45e3c7f5a6815a0a7ace6b294be29f90ed9c9ba0660c5

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