Malicious PDF — malware analysis report

Static analysis result for SHA-256 d854ffa91a12170a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 22:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2418adb8d0c32ce0c63cd581b4a1a716 SHA-1: 626624a843c7d950cec8fec887c8a02eeec21941 SHA-256: d854ffa91a12170aa800533fbf2a9cec913ddf109fc08ad24a653c208b5b9a10
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on compromised websites, suggesting it's part of a phishing or malware distribution chain. The 'Clipboard command execution lure' heuristic indicates the document instructs the user to copy and paste content, a common tactic to bypass security measures and execute malicious commands. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b0fa1a09---51900627918.pdf In PDF document text
    • https://honghow.com/ckfinder/userfiles/files/lezetiden.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/sixemibogepefopus.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66934467857.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/26336853250.pdfIn PDF document text
    • http://webursitet.org/Files/file/rupidagetotogusujorojuju.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/ximolokoxesekotema.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/merev.pdfIn PDF document text
    • http://cga82.com/admin/File/81783700037.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xegifidomorojubufajefab.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/60819699725.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/gatisewarevavatogarefoje.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16205848723393.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/penamuxutolizeviwakula.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/76783090552.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/mofijifub.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/37393782230.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///dogezotiva.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/jiniguwedipotefun.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/86070027425.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/bumosorerefuwevod.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078ffdc86941---vipirejenoduwu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611915dd3674b---6484306369.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b372fed7814---norix.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/41283894226.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/nosubibefojuxeguzalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mupdf+android+studioPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 23656 bytes
SHA-256: eae4dbccc4f2ac9aacdb315eb72afeba055c86d80affd63ea2d7a5729344ea1b
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 10408 bytes
SHA-256: ae5fada64671ce761bb769d918fff693ca39aedd00f0b55c1a2dc9f4b869946e
font_03_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1