Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9de66d63e7df87…

MALICIOUS

PDF

87.1 KB Created: 2021-08-08 00:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a900a8acbadc4e0a85d5b5b97af319ee SHA-1: cd1a8dd2accf13ccd17a5cb84fde712fc1f8a2ed SHA-256: ed9de66d63e7df87267d84b9ad79e340a1b9a5246493d4b7de6bd4f3b09a302b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e00d583099860fe5cd5dcdd93c787d47/namesujolevofit.pdf In PDF document text
    • http://change4best.ru/upload/file/83483299821.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086120f1e188---rujupogupolunomewa.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/4435915987.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/33060780328.pdfIn PDF document text
    • https://tcremich.lu/files/files/17331222044.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfc0b1b28---pumofagelijurera.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/14369382027.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/17931376245.pdfIn PDF document text
    • http://cartopack.com/Images/file/98557945385.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/966d300b8d91126f3b7fb20d23c36012/3168032391.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/687ca752716afc3b42892aefd2ae67b9/pasaboputanijefuzev.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3c42a40e---wuxexumenabaniwupovitaxu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74274653d---buzis.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/joritakoxobetos.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858782ef54e---jilew.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeddea259---fatokuwiberut.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/74251343224.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16091243419786---webeg.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41191131470.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/239a1bd8b3041264fa4fae2675053473/tuliribisemexovowoma.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/32429111108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=libro+bardo+thodol+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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10288 bytes
SHA-256: fc48366620f8e8c95a66d328d5e927096422f6040b1f4b81046492be3a76f4c4
font_01_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 19996 bytes
SHA-256: 44675ee5165ab6bb1f15f7cd3bf22f9c9e724473305ad9a589937582b6cd1561
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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