Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e09b03aa7bdd1b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 17:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fe45acbf93d67cfcb4bb10a64643efa SHA-1: 434ddf0ae995c9a82f9e7594672524e238c774d1 SHA-256: 37e09b03aa7bdd1b9c3b7f43a82c8b3a82d176c06c291cf4f9ea2fd79e96b026
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141259db942d---41356926440.pdf In PDF document text
    • http://gilendor.cz/userfiles/file/giwal.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5c419c08bb35ff91152c54091ba9c9b5/88312113224.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/25342740550.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/duwarem.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/707cbb047245837bc12eb0d3cef0490f/fukolevededelofozazemus.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/losodobame.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gijuviw.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202193256245126.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/883be1cbecc250180ace852f95b460f5/gegarur.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/72073760355.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vupejoruw.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/84783560174.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/nosiverumotadu.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/busolorubosu.pdfIn PDF document text
    • https://nexusmediation.nl/files/76173319535.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/zagalobexajegebavikojakef.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0569035973.pdfIn PDF document text
    • http://pedraferro.com/files/files/kalarobafulokiwanar.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/vipeged.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/bafesitujekaxugif.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/2427870267.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4718d7daf---66403490688.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/ribubasenaribumijivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=market+leader+upper+intermediate+practice+file+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 18356 bytes
SHA-256: 10cd0c9dba6d42b93435a0ff2c729a7a22a542e1717c0228b67d6ff19fac3ba3
font_01_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 10676 bytes
SHA-256: 0196ccd7aa05d1565fc6a2d5373f5e9d1bdaf2dc387931ccd80d1ea232709bb5
font_02_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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