Malicious PDF — malware analysis report

Static analysis result for SHA-256 a838307cf6e375a4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 07:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d21b39eb016dcb4b8e3a8691997d22c7 SHA-1: a1234a2bbac12915a78c90325fb920ae5274d4a9 SHA-256: a838307cf6e375a4ce34c532a9af2c1cda17837a4e76ca04a059ff8cd8d20291
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains JavaScript and multiple external links, including one flagged as an algorithmically-generated URL. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick the user into installing malicious software or providing credentials. The embedded JavaScript likely facilitates this by executing malicious code or redirecting the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawuvibuguzanofufomaxu.pdf In PDF document text
    • https://iskoruma.com/upload/ckfinder/files/woranejovukifapemaferaro.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/lbssurqgmvu782510ermlhs5c6/27388577639.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/50454737760.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/mawatiribijogajukukujufuf.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/jakov.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28fd21f33---goregarujo.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906143122647153.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gafog.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/75302126401.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/52805896441.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/60019914848.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/rumudilogefodefu.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109091824031082.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/63218532846.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/remotimavumeratikebot.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/rajiratoditupe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f4326bf875144006b262b9fbdc675559/meditoxojipokofapakalado.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/34241291332.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/18426773554.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/7995679304.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/80966674524.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5722b0945c5fbc5273dcc886293823f2/zivosebowevisifute.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338e7667a74---51334270635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+do+print+screen+on+android+phonePDF 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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10644 bytes
SHA-256: 47593f2396e1bc9f044e37cce59f5e99d113d382080ef507b236d8cd00bfd7d4
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 18788 bytes
SHA-256: 39489c941e172f16644fa020eb60a676f23b7860337479f193343a1597595527

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