Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd29c4a75559bcf8…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 12:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdaf234fecd0aeaff9f6765b8647e18a SHA-1: 2baf4b50fd42fd0ba767ed52a68624ebcc2ffddd SHA-256: fd29c4a75559bcf81f9f20857867adfc0258e1e6b6b1cf6c02b7e41186a93d1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://szyldkj.com/luodan/images/userfiles/file/xituweget.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cca7278114.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bad46c8170f60e642a1af551917807be/jenawaduwagubinupujevax.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4233f82e757d21fd933f7616a247695e/46237034581.pdf
    • http://ogbchurch.com/clients/880797/File/10405831264.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf0191c82c---25101473475.pdf
    • http://alrehabourhome.com/userfiles/files/repesuwumegewofenaser.pdf
    • http://amoy-art.com/Upload/file/66561291544.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/vimazuxanapejufi.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/2f2aa2f334de8faf749e29861a2a9d33/teterofixoxob.pdf
    • http://sooclose.eu/upload/File/rexizegaruzuxew.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae24c0d5fe8---39892053230.pdf
    • http://suamayin.biz/userfiles/file/fupiwatisiv.pdf
    • http://zuche0551.com/upload/file/10666772358.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/colch3jfa7usjqo1l2tsggbf05/tabisakudinasuwafato.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d16ad35c6---91894526326.pdf
    • http://alternatifmedikal.com/img/userfiles/files/87635608499.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/2h9opln5ggss21b2oruna93cp5/56077097160.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/18749739283.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/80dc85725082ac8cea254b6d824ddd73/lisovuwumogi.pdf
    • https://educhina.mn/editor/files/labuxirorakamavegunujoti.pdf
    • https://chpcentre.com/files/file/21884086600.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ae570429295f9195c1584ecb8c9558f7/fetevude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=go+fish+for+free
    • 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_off0000f296.bin
045bc25569f55d7e1815e21a76abd92f3bb1e04ec3e50eeff3ef4b894a7bc1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 17176 bytes
font_01_sfnt_off00011f63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
font_02_sfnt_off00013779.bin
2997153f2bbc02e2fe03d2133f24a67de71d27844de7a67da77961d5ee5f334e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 9940 bytes