Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a27ae8ed4cefb2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 01:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1e81ef230e635ef87c1ab2695cb18ed SHA-1: bf8365549270a8d3b4ec5237d8a84de36faaf913 SHA-256: 40a27ae8ed4cefb23c66445dba1947131261ecdb2f1ef9a40f2e3dc3eaca4ae5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://valserve.in/web/k/main_admin/ckfinder/userfiles/files/41415962279.pdf In PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/85171831086.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/281e3036a394abec29f3cdcd2b243fe0/sovijepigoxolev.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/nepasusuwosumajaviw.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/xabuzatakevifavowed.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f2b8f18cf---jegigetogasuve.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/wapujakonoronupuzog.pdfIn PDF document text
    • https://music-group-store.com/upload/files/fopazegiwamubun.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/7496741909.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/87205836643.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/dadipuxapidamoxazot.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebipateg.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/xiwadenorenikekivatuxevob.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/87498242235.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3knrlhmufs6tnh8cpf8j2fe46c/tumobepawu.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/28140996779.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5027b278e---lovazekefafojenos.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/65424287265.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2dm98h1dr3iscg7fs8q9gqvfn6/dofaligavikibimudag.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/kvs5do7smnt03kneb0fit8of71/71167424139.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff71cbffce---81514468680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=definition+of+types+of+trianglePDF 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_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 18696 bytes
SHA-256: 2a4d4c917b3642e3aa4cf3490f9e2cb4b942e2e1864af821f4baa3ec503e30f6
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 10648 bytes
SHA-256: 03a1cb9c7e385c5d9145ea987bfeeb387172b2156249b1c08ad957e5aa5b2d8d

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