Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad43c9db1af8129f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 17:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f292c8c0b574b741449d8aded806cd1a SHA-1: 0bf8e1d7ba1d381c621ea4324b04562d01248a8b SHA-256: ad43c9db1af8129f2fd296432928ac3a2bfb1892da1815017cedeca0d2c6ddfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixabiwopiwexuvoxol.pdf In PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/fabodigediw.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/serobogipavesavusetago.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6b2fccbb325dde78d8dfe1990f5937a8/56369815226.pdfIn PDF document text
    • https://ahha.az/userfiles/file/dilisagemozomipeke.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pagisubinu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/50122134972.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613782903ac94---373393375.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tovugekewalumove.pdfIn PDF document text
    • http://petrduchek.com/files/lanupekafoluganapawezafe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353f525d652---bafevapisadepuve.pdfIn PDF document text
    • https://wasael.com/userfiles/file/radatopamowisobodolutudaw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133efdb76d47---17246274257.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/82065870984.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/33758132059.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/jeguguguz.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/33800964406.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/niludawululezurepinawex.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/7245427593.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905224958_x0xg4g.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/mumexinidazujatavoxogel.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/21439841618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+blind+side+full+movie+online+freePDF 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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 17888 bytes
SHA-256: 41607f1fb3305c6db638c4b0d973640e8d6771384f9b90dc61d7e6152bdd15da
font_01_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 10628 bytes
SHA-256: 4c31acd93f95626e9394c6ba67e65b9d5f103265095aef01d95aa0d2b22b5d64
font_02_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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