Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f5f4fe65e882fa…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 15:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 199c0e73d9bcfd488ea60cc71f427e40 SHA-1: 25a8a0ec7fb17020b1809b5d04212429bfc11371 SHA-256: a7f5f4fe65e882fa5cd613462a45ce363d615a5ca61bbf5e2e5d367c79fdca65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gugakor.pdf In PDF document text
    • https://sapporopools.com/contents/files/40734169607.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/6087009119.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c930588fdd---6235207374.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140107b8e0cf---nunibapimexi.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/womapibovavinus.pdfIn PDF document text
    • http://pronobile.de/catalog/file/tesezomep.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cac5a308f---femumanojatorog.pdfIn PDF document text
    • http://punaide.com/userfiles/files/91291389842.pdfIn PDF document text
    • http://kisito.com/userfiles/file/53439014000.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nirumenovalutef.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8690628e27b3c01b7c2007b71ecbc0d/54903816547.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/revezugomafikara.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/59803717089.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/63668903159.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/fenugenifunowoxidenejejet.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/86717163090.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/43764485690.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/79832671375.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/26704557614.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/2032798683.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/rerudijapanon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+see+instagram+accounts+without+an+accountPDF 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_off0000bc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0A 10808 bytes
SHA-256: dcc42801ea6de1e9c3d906eb7b7220b1a3b4bb58c4fe4942a028dc9a44be9b75
font_01_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 16480 bytes
SHA-256: 8d5ff2ebada0baa552176c62bc37bc0250e300e2942bc73d6e1c198a6ed9fee4
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1