Malicious PDF — malware analysis report

Static analysis result for SHA-256 840d795eed8327d0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 02:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42f4a1eeac0c1e65eea207a45a0e24ca SHA-1: b99b73c3ee84fc508c1aaf2faf4c0b1e7d3d7819 SHA-256: 840d795eed8327d02a5fce59ae9e2d0219dc66d30e63ee8eaac35174605f65dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The primary attack pattern involves luring users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=can+you+embed+mp4+in+pdf PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160db2c93d3408---68836974271.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/77770383201.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/7427922101.pdfIn PDF document text
    • http://mp-journal.com/media/file/pikuzulifenabugekegiw.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21081708411857174896artv.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59f7797ef4b244d952dba197f67f4f19/vadogoxi.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/panekagovonilageromanuzuz.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/povubade.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/54158735395.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a7adc3949989c8c6d6981e286fb42a34/zusoludizuroxifelinetop.pdfIn PDF document text
    • http://sushi-belovo.ru/files/97471387738.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/25636356551.pdfIn PDF document text
    • https://anfauglir.com/images/file/pidikeropasom.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/436ffd5afb2b70c1be4d8ed7b3fc011e/seduxobawemit.pdfIn PDF document text
    • https://hojoairport.com/images/file/zenonuvawadokav.pdfIn PDF document text
    • https://mfdesign.hu/files/file/47511196981.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/moropagukujo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/55560192278.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/35092507147.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/12150019401.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/pisagomukupovuvugakuzu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/28228819628.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/52322905349.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/75265201472.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87948e9fe6---34301425427.pdfIn PDF document text
    • 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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 16444 bytes
SHA-256: 8cc932cdfb48e01de793329dda699e479206c0a25e8e0a5a4c10a8be136a1fa4
font_01_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10712 bytes
SHA-256: e53aba3fdf746682613c135d97b0d86f00a8deaec16d8904cf3ff99266c3c37b

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