Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81a05ffab8ba2d3…

MALICIOUS

PDF

99.0 KB Created: 2021-07-24 08:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f3aaa3f3b4eed11082c7902e472eb71 SHA-1: 6ba67063de79b7dd7309538e714ef74793941c1f SHA-256: e81a05ffab8ba2d3fb478ed271af5f0b79c99372e0ca3592de5cdd0459adcbf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 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://kuepancong.com/contents//files/6793573044.pdf In PDF document text
    • http://babamoleskine.com/files/file/64819201557.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9ccea24fc888d3dc8071b730bdac0b31/99216141989.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/kofoxawux.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b294fadc34---dozikilosu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39d89932ef3673921c7f3fc1528feaec/nusaj.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5f08e24b823c94f080feb3b169623b5f/32102806086.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a6cd16b7---dafipiwuse.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/325102d908d026c5eb19ec42202e0bfe/51198179818.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772fa7ed5d6---44133213819.pdfIn PDF document text
    • http://c-amc.com/upload/files/85979683998.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/36735352607.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/wisodijetetukoputekifi.pdfIn PDF document text
    • https://ivanamihic.com//files/dakutudimisuxenun.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fadef4e59447aba9c8544a8991fbbc1f/56898317605.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gixolirupolobumajom.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t3de415irk71tucja4etbns5uk/74776960608.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/xarinosapolojojunumunomax.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/24321895200.pdfIn PDF document text
    • http://a-pluset.com/userfiles/46040575788.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/17534952467.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f68e2d0ab410217af0a718d2b3e69833/xusofugut.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/2672293684.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0437ed74---zeduposozoti.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/labosivibed.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0b6c6e26---mejajibenufelafutujaveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+classroom+managementPDF 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_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10672 bytes
SHA-256: 813e10a7b44805713fe331977cf179169a259056fe5f9105677f4d3f5afac672
font_01_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 17816 bytes
SHA-256: 913f54fd489c69da4b7cda134d1a95f5db699cc432a71a1ecb6b9775e56dde12
font_02_sfnt_off0001654c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.