Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51990a28e1d512f…

MALICIOUS

PDF

58.6 KB Created: 2021-10-01 09:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d521618d66ca201d3d79f7053d46b48f SHA-1: e364b3c18de44aa0a2dcb96a459f9f6b1b5d0589 SHA-256: e51990a28e1d512fa7256f4e55b6489a09574ad12d36bcacfc48bdfa7df96cc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous external URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to host malicious files or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

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 https://pgprojekt.pl/Upload/file/22628572482.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3bbb4c52222c270e0ad039d34a75ba9/kidinirug.pdfIn PDF document text
    • https://zzwgjx.com/d/files/1505190651.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/24742467315.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/84652095322.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/damefa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d405e6d46---23322911817.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcgf8vt5ivj6q5elhn2k6902r3/53492214400.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/nebunixutoxujadidive.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/dogeburuzufiji.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/jewekikip.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210922145807.pdfIn PDF document text
    • https://kermanrooz.com/img/files/88019057229.pdfIn PDF document text
    • http://cncsprings.com/d/files/84723007643.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/8176011687.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/tomaxitumimitov.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/wevof.pdfIn PDF document text
    • http://erictex.com/ufiles/files/19433420205.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/noverejewo.pdfIn PDF document text
    • http://a899.net/userfiles/file/rezanisuvunib.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d4de9bd0---72655199055.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/29498562695.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/jerewewuwuli.pdfIn PDF document text
    • http://pvvc.cz/files/63184199516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+android+sdk+for+windows+7+32+bitPDF 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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 16068 bytes
SHA-256: 8700a2bd58842545412f0674fbe771b8b39e8764b105149c6a8d266a99c3648b

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