Malicious PDF — malware analysis report

Static analysis result for SHA-256 661042ddb0f5b49a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 21:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2e865cda2e7d93f4e8f380fd1ca36a7 SHA-1: 98421e7861f05a55637b8eacbd1827b8e5b446c5 SHA-256: 661042ddb0f5b49a85dd0523f47bd4db492187a130807a40a649d103090ac205
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=disney%2B+apk+android+tv+box PDF link annotation
    • https://cafesca.mx/ckfinder/userfiles/files/napetujokusixe.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f588d7746---30895764067.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kabifuwofuvuroratepokatu.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83373337483.pdfIn PDF document text
    • http://wronba.pl/uploads/wysiwyg/file/gapusotoxujapenumu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/buroresewanapemedaj.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/7594141350.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109071234417615.pdfIn PDF document text
    • http://dominant.name/userfiles/file/46443461503.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/10f709db44ad446ff07e961766cb0b7e/66274114832.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495308e18d---77436466514.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f97f809---75274175086.pdfIn PDF document text
    • http://nprofit.hk/userfiles/99762581570.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vasapuvukajitesunen.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/pokejipipoxobitup.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tezosilimuxinub.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/72032802848.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/87692019283.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/romunulenomipobipovuwexu.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/joluxowela.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/61002562708.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/92800258196.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/xorotugeririri.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/31096515702.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 10856 bytes
SHA-256: 7d0cc3c6c0eab7861381610656a4478774466c134141d8101c21c9b9fd56bf4c
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 17712 bytes
SHA-256: 129bd6326952a8b31a5e07b4bfdad61e47191473a0b23f7e06e6a14a4f321db9

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