Malicious PDF — malware analysis report

Static analysis result for SHA-256 395c54fb455fafb3…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 19:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 367718a70459edfd0a7dfe3b08816151 SHA-1: 1d0e459393a1378fc900226164de5f26faa7be17 SHA-256: 395c54fb455fafb32b86fe27fef6acda5349aaae60af92cb9a05aa198f09497e
164 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external files hosted on compromised WordPress sites, suggesting a link farm designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6f43d341---tuvupedasukofobi.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c251e3e372---wonezodegedezigam.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819edcc6131---werofudufiwipoganuz.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12c8d611f---riteba.pdf
    • https://dolaodong.com/userfiles/file/bivuxef.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273a1d091f---10846462274.pdf
    • http://from.ua/upload/articles/2021/06/19/files/texulotawakuxefuvi.pdf
    • http://mwflower.com/upimagesfile///vorepixapaz.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/motuwudisenugigev.pdf
    • http://anandtouristcorporation.com/uploads/73631877446.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d5f5921c99c5372b0c7f1e7c8c5a77f2/6917456890.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f836d5d675---patulegu.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8ds9qrv4kmraiug7d8bspnpqv9/dujijipixebolidamaviru.pdf
    • http://cropscipublisher.com/files/upfiles/file/56129940454.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c49787e2a---pezijewojezekukejudilemek.pdf
    • https://brahmagnanam.org/fck_uploads/file/52661239295.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073e53beb04f---xirapoxozipetejojumi.pdf
    • http://angelescare.com/userfiles/file/mijanenezeli.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/fcd2f8bbbc22b65cdd7a638bd49df6ec/29426978595.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/7ae88d34defb430428545586d439db40/najapodepapalogufedene.pdf
    • http://vasvaripalmuzeum.hu/upload/file/43975307432.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c51631a0e1d---lubako.pdf
    • http://arohitourandtravels.com/userfiles/file/fevozop.pdf
    • https://haysalon.com/public_html/userfiles/file/81956087146.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=word+and+excel+to+pdf+converter+software+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e645.bin
9a6c33f794fc5c56750f4b60452998145d1f70cbd94c4b828058ff854c9427ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 10768 bytes
font_01_sfnt_off0000ff46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
font_02_sfnt_off00011758.bin
525611d342257c8d82718944bfd9b4f6fb6eee963da68a506a8f2c4074b293fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 17240 bytes