Malicious PDF — malware analysis report

Static analysis result for SHA-256 915278ec6e2f3a9c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 29a033e66cbd4b20ce963f6d0af1947a SHA-1: 4c9e5a695e041e6dd3901e3c3cfb8fbf6154729e SHA-256: 915278ec6e2f3a9cb15bc3b3a5fccf7da029fd2d8607472e65bb91aff57675b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://yodobashi-church.com/57895486032.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hk110egg33gnnh29otfcldajr0/kekaxumewelowaxu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/60186283025.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/nevajakijuzebosiloromuf.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/3367954191.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/34442279103.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3b1cd4c3---96555806150.pdfPDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kh23vdmmr8dpnabff41ob453rh/metitegomilumuj.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/gavivagad.pdfIn PDF document text
    • http://polkovnik.su/upload/file/nuwumunemiwogitudemewamiv.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/gamifotolepato.pdfIn PDF document text
    • https://tmtteks.com/files/25893799955.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/23561651496.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/48591756326.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/cde85e16eef0065b1be383ee37f2b2c1/bixebetaju.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ecaf9a18dd17819827d05c4ae839a6da/41845321530.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/62182835198.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160942fbe7ce4e---78777808950.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dedafdd2b0811c0867dcba51fad5138d/pomuge.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/lowijawiwilepilil.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd4b470f53---levewekeruma.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/41513625833.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2a267b01---44985310273.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/3503120430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vw+sharan+2018+technische+daten+pdfPDF 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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 11108 bytes
SHA-256: 0f4ec87f3fa20ac2153fdad1b0a8d14509c93f68e0906b0e6e5f0303363c9fcc
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 19432 bytes
SHA-256: ad81cb76aae27f28ad4e685dbe2dcaf81b376aefccf66a42bf348c35891662be
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1