Malicious PDF — malware analysis report

Static analysis result for SHA-256 534ba1d62153a0fc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 19:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 133dc46684648804a9b83722bae6fcc8 SHA-1: 52b1067946d3f938ea7ef4ab96f95d2f67d4fe8f SHA-256: 534ba1d62153a0fc44e44cd8a50d5abc2bba89dc7e1fa435a7cc344a5c2050e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, some of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the 'download button' heuristic further support a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://huntic.ru/uplcv?utm_term=chalte+chalte+full+movie+download+mp4moviez PDF link annotation
    • https://planningpvedh.nl/ckfinder/userfiles/files/83549082064.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6dc61123191f9e4e4341a9f4e5d32dcd/mutufupag.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/31929585086.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75628152155.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/66182722942.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/pogatuzifoniwavowujipu.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/ludeparonefezajirenas.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/15815623068.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wonemewoxiwapugajewebuj.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89914097164.pdfIn PDF document text
    • http://erdbau-rauch.at/vixiweferogisirupewokom.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/wurij.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/24433971396.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/kopizumokemakerame.pdfIn PDF document text
    • https://membermimpi.com/contents/files/nixawoj.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/12986333076.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/wugasojeluvekiwesem.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614406a4aef45---nogad.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614081755081f---81475972563.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/ranatog.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2d8bdf298ed3620ccc105056b3fb74a2/1058613995.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/wubelero.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/71515912993.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091313534973499.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/67120719726.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c
font_02_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 11036 bytes
SHA-256: d4f06565aa70d27d8526dd8ac55846aad65e7c55149664b34ddc55227fc499e0