Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c80ab175bc405f8…

MALICIOUS

PDF

58.1 KB Created: 2021-09-30 13:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1b7c0668b7cc7b6c769974c7737ab94 SHA-1: 4e6dc4d8a6abf44a2376d72caaafbbaa891af7fc SHA-256: 9c80ab175bc405f8103a3ef1b8d28d59027a4a67213ffc11f505d829a990bf77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm used for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to lure users to external sites, likely as part of a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7423

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://henca.com/files/details/file/gidogafiwimadarirumip.pdf In PDF document text
    • http://veszpremlizards.hu/_user/file/18654140625.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/kodudona.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/xurukupidisojer.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/99648606583.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f4dc24e47f9138cf5512c350180db066/rusufujujivewajez.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/demumutotulomo.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/suvegikosewejavokod.pdfIn PDF document text
    • http://pk.mo/userfiles/file/64789031238.pdfIn PDF document text
    • http://aweibel.com/Photo/file/dekejuzaparojisenifi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f5c51e1e---59214877415.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/67220135956.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/lunukobowemovezufemanijo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/maxajorimevawimazuvozujo.pdfIn PDF document text
    • https://halead.com/uploadfile/1631346270.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/51351336762.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c20a1e6bde---54499331297.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/redanoguzojofig.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/66611303595.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/99652714066.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/tirubimomekarikilo.pdfIn PDF document text
    • https://shinaltd.ru/images/file/20914632816.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68699539634.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/nuzuvopavamonigapakok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+phone+data+backup+software+to+pcPDF link annotation
    • 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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 11072 bytes
SHA-256: d445fa91f9dfc7905454a887839f2ea36d30493b91588385d7bc597fe6be99bc
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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