Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30328a581df0eaf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 07:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8745f18c27a6a764a9b920df51ffc295 SHA-1: a77001a11360598dbff44ec44152aa883b931095 SHA-256: b30328a581df0eaf625c8b1e1848e19e74e2cd7ac8513d2685994ac519210cc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious classification. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.uds-myanmar.com/image/upload/File/52756185508.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b76ca5ab15---36700939369.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/79537994411.pdfIn PDF document text
    • https://vitanov.rs/files/35612367485.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/jaxapejuwesisesilovuvur.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/lexevufokopegokeb.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///lujimevodoguwupinegusa.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/powanakofisalezozikomo.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/33009615464.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xebeliki.pdfIn PDF document text
    • http://hbaoge.com/upload/files/28575110786.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/kegixulupif.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24c0d3cba---japesunozegi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/4458859534.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/vizadekijovilugonokudo.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/88123886061.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/8617851883.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/40834586557.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kukujixiruniwisi.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/ranasunive.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/xarif.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/soropavisujititegone.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4a98e17ea46c0518c36f35a28ad8792b/xoviduvuxifitevemene.pdfIn PDF document text
    • http://scsychem.com/upload/files/21030138442.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/zexeselunul.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/48627164056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+pubg+apk+latestPDF 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_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 10792 bytes
SHA-256: 81cd920e928ffde0b78e906dc62586ecacc9602cadf2c1c1f19a8e3434b2a72a
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 18612 bytes
SHA-256: 1474b54e2f1675f5e5ebb3491463ec0f9b97b128f648edd1db0e5b51e3955f5b