Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d67c07f513b9a21…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 14:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 651b6f2879571c5f5664c090a1893efe SHA-1: 1dface0e7665ce7fe4cc0968074fc4734be84eec SHA-256: 9d67c07f513b9a21b9a378734049e838cbfe479978fc204a385dd6911b7b0512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://ymy-tea.tw/upload/files/37145669866.pdf In PDF document text
    • http://jgweld18.com/UploadFile/file/20210906064727141.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/pivigijugiru.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/gavebefotibajikubamabire.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/romopokopesam.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gosepidizupejewexorinij.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/larezigesatigamowi.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/wusolekamo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210901080229.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/50535000995.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/52248061069.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/84762760581.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38206056323.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/43882963682.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/valexeporijakafabase.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/gavesagobe.pdfIn PDF document text
    • https://loyd.rs/images/file/36228149175.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/monidiz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613460b031b06---tibewa.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ed517e7affda49537545759dec0b2121/nogevilituza.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/jerikinunagof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=xiaomi+usb+debugging+without+simPDF link annotation
    • https://lapdonline.org/file/todisekiligez.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6b239df550902c64926d7ff8fc54f5c3/riworunidik.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_02_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 19504 bytes
SHA-256: 6edc29f6ee6ca3468565f1b9855464ab6134341f070b844e71c7bf766ac8fb03
font_03_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10880 bytes
SHA-256: daad47aba92833e936baba019d3fdb4bdff07d0fa6921cb28e9db26c80359e44

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