Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e575835e27ac4cb…

MALICIOUS

PDF

83.2 KB Created: 2021-08-03 12:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36c30076410fd99ca5ed78138087b44f SHA-1: a8c8863390a7cdc58b3ffd1704b99b6e52b8c8c7 SHA-256: 9e575835e27ac4cb19b22526ae99f538e10351d61e61b84064752a8845d7f3df
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript indicates an intent to perform actions beyond simply displaying content, likely to download and execute further payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3974

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://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/310e245f528369b70997f2aca1aefda4/zitenu.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/8328637724.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21fb631c3---96673386843.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15217fa54---89003317499.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/abe520481fb0656825f040eefefc312a/xalizeg.pdfIn PDF document text
    • http://stattus.com/assets/file/xodasugiwimivefikuxiz.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ad2c43f9510fb702ba190b3abdde9a1c/tadaza.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e82705fdaf---611818775.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/78464973381.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d550a1b36c---mefisukunu.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/15529122253.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a134744d430---38401222628.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/46571240634.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0e6d5154---83029815158.pdfIn PDF document text
    • https://maturana.cl/upload/file/36017828975.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/bitigifisofidaxiz.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a8cc77969d5e52a54732e37d0fc35c73.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/93a0en7hltbsjna35kjm061gp7/kavazaxolebebetajewobatuk.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/tudupomiwu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210728_004941.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7025ca7d0---77907347494.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f06345227261d5435afad3e5ff776a16/52808852738.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/48317216a532bf63825589c161e7ebcf/73849105279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+best+app+to+save+videos+from+instagramPDF link annotation
    • 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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 11096 bytes
SHA-256: f1b833b06fbd4a2c48392df241519b787ce2154177ca49ce85e886a85bfc8b64
font_01_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 17900 bytes
SHA-256: d67737933a9d1b11e54e090b5c83df90d09e1d172fb0d107e68e3399550181a6
font_02_sfnt_off00013998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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