Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dcbf4fe3162cc3…

MALICIOUS

PDF

64.0 KB Created: 2021-09-16 23:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 511c29b8216dad2548377da143a7f683 SHA-1: b3a0a766cf266b040b583ee0c9362d1899ee2d51 SHA-256: 43dcbf4fe3162cc3352b00a96b49521327f44eccd931fca00e272d7605371602
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure malicious activity. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=zombie+fire+game+download PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142c230e135f---97253826955.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/92654048094.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/fugejowawekopulukikusawu.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/18822943706.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/42852937072.pdfIn PDF document text
    • https://mahae.hu/files/files/45644899207.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/72857183146.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/39401142431.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210913180738.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/52794418209.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/76094152651.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/98270740459.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/jokidusipepakoremalanuli.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e905abb3a---1487535897.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/10559963652.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0948053001630826316.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/59865131036.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xakurafe.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/xikerasuxe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed6c3d99---3177511892.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/43682390506.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/baduvovezavakoxovo.pdfIn PDF document text
    • 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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 10620 bytes
SHA-256: 61057e0890c40b3ceade35654f0851dc70c2e31fb4f6ddf9a1eab2f3fa5301a0

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