Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b2b8b9a283062c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 19:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 089897b92815394abb11d6948047c2db SHA-1: ae4fb9a3838df68e5f2279119605a167652fa984 SHA-256: 28b2b8b9a283062cbaa4f272917dd0edd0572ed2a37a99c5b597871d60675af9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a1e5379d7f2b2aad22a9a59192e616d1/jawewetezibitemop.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3413801d6---79640491340.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/85965328612.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/malonirurusuzubelajenibom.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/187e8fc53af680ac95947518d3b790d9/27388437741.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jatuti.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/suzitepelivejupeloxerabo.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/rikatinajafip.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/25065998501.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/20626108226.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/58348414440.pdfIn PDF document text
    • https://shinaltd.ru/images/file/2400649301.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kuzolunemolofajaku.pdfIn PDF document text
    • http://regcureguide.com/files/files/39385312046.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/57562502125.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/41248445064.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/zepateju.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16134556d2d848---kizufe.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/63832458871.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/26687623561.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210909_E709E5D45B25AD79.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/59544720925.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/86312487895.pdfIn PDF document text
    • http://scro.ru/pic/file/91747360404.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/57084270028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jathi+ratnalu+full+movie+download+movierulzPDF 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_off0000b2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 10752 bytes
SHA-256: 5003b3c308b52bd4f250f7842b21434bc21bd5b47ed675806e45bc7119a98ce3
font_02_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16392 bytes
SHA-256: d271a4261a8e2e0950482d34a34164d56c93df499fa70add983ab29736e94292