Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c390a00a2c0307c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 08:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9ac603d5e5afe7e684d96700f66063a SHA-1: 66eb05c8f3d36f933a91219faf37cd7e262efe9a SHA-256: 6c390a00a2c0307c93a210bd2c64a9efac146178a4c0d8e72de96bd6bc35206b
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable hosting sites, likely intended to trick users into downloading a secondary payload. The presence of embedded JavaScript and the 'Download Button' heuristic further support a malicious intent to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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://nhungbaithuocnam.com/img-tvdl/files/95564845774.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210914134951_sd8tt1.pdfIn PDF document text
    • http://ombs.ru/uploads/files/60922115446.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rizokosopugutozewavasutep.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136928e0768e---zivijubixuwubufokoxi.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/14486562835.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090312334273499.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/74945970763.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/66835310187.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/velawewikoxof.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/68689866535.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145498523dea---6317752469.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/79363884604.pdfIn PDF document text
    • http://mestan.by/images/file/zosapunor.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/manasitelataxobivunani.pdfIn PDF document text
    • http://sinners-party.de/media/file/kanisuxi.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/78444459238.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/23495650343.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/nobupanikijiteripopipel.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/kuvovum.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/62a5360b7184ae15770abb5a84a8b8e9/namomifumore.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/46793697247.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/59100495973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+web+to+download+moviesPDF 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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 10656 bytes
SHA-256: 347b5e981e519b64c3d0cade8d99e21580ab04ddb34d8e3e1d9a3311ea78675f
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 17224 bytes
SHA-256: efc81d48805410f5b27cebf4174e991f39fc465f29a29fa97fc3d3a6b0feba2a

Open this report in the interactive analyzer, or submit your own file for analysis.