Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f9c190e22d45ae…

MALICIOUS

PDF

94.0 KB Created: 2021-07-03 01:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 679784a128b6fc092af938303aa7ece3 SHA-1: a5f1f8d890f27361dae5f93e47d8a995afd90bc2 SHA-256: 20f9c190e22d45ae22e5b4855755859d9bebd04b22b60d9ec5838718d4803e53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 multiple compromised WordPress sites, suggesting an attempt to host malicious files and distribute them. The presence of numerous external URIs and the use of disposable hosting indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://leadershipcareer.kr/fckeditor/_upload/file/12801594746.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed117d610---ziguvapibazagafoxe.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/406ae1711dee52212a79c2426635f67a/dezeb.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/4050601445.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072492fe3781---90344305773.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/tenoxigixumetoguxuduge.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/82706973739.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/12c70d525a905f039fa5050664c8d9bf/4715200544.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/48bcd07d06bd675e3e47b0198196b1b2/wiluve.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/dutazifurimene.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160878bd53d09b---54213352706.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/594c3488325fc55b0c866cccb277cd69/11201243897.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/kolisobebufazuxusug.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sazuparokovopovidam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/75f68a14f9218dbeaf746f770960523e/10637591687.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vavhhi2rvh5aopprteh5valpe6/wudozosili.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8ca4185d0ecdeb1b3935f6a7ae67ef65/zakebonibavawaduxasokoz.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/15817978883.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab03b6e62---27449008779.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/df84fb093c818955caae4a5ae0b5758f/rulalexezuxowofujokerug.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/rigojorur.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1be987f62f00978a14681e862ed21f55/62165377520.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/38452688811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=current+affairs+pdf+file+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10708 bytes
SHA-256: 18bc89c6062f04c63a352e13538cb2ce33aca64afc663df0976c188513ff4ed8
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000137b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 18164 bytes
SHA-256: 364c8008a2d7da59cfd2143bbb9110907926d4172aed212d8977c01ababad7ee

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