Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97e1f1224b46d70…

MALICIOUS

PDF

94.9 KB Created: 2021-09-08 13:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e7f091b2c1705800b0032c74fc91139 SHA-1: ad06eeaba61ffbf386873f5825893be011e8d0c4 SHA-256: d97e1f1224b46d70a0199dd88091e793628cb08379f46cb5d364a8a46365de91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm points to multiple potentially compromised domains, suggesting a phishing or malware distribution scheme. The presence of these elements strongly indicates an attempt to lure users into downloading further malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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
  • 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 https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1n3stml2qq2ltdrm1aupm0nlks/gaxiribigomenuruv.pdf In PDF document text
    • http://labsshop.com/d/files/nezilajiragomajemaramulo.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/28210159868.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/subagorovetomoviwoteniwix.pdfIn PDF document text
    • https://websbag.com/uploads/files/39918335990.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d3c1a5034fef968cc2c1d9e96f5dada6/wadeketewepejimajetuxeku.pdfIn PDF document text
    • http://vuason.vn/upload/files/gugebedabowufo.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/73282584989.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/19576039223.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/judinosumejigazilejizuzej.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/15690117202.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613875d50c5d3---62739934558.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613807798605d---68112860389.pdfIn PDF document text
    • https://webmenuplus.com/images/file/ronifodirozibowos.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/99888695147.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/32830344149.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/37791263159.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/xiwaro.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/80897434241.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/nukup.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/dufuj.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/tetamazokana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=liste+jeux+pandora+box+5s+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_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 17276 bytes
SHA-256: f42e653c6b1d3534618cac971d52bf08ea1f65d3f47e425e41c4c3502ca188bd
font_01_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 11008 bytes
SHA-256: 9a3d172fe15376ae99339cd46eb39e24fa18465a35bc3bc9e463a2a770a9daed
font_02_sfnt_off000155fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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