Malicious PDF — malware analysis report

Static analysis result for SHA-256 29948eb53e495fc1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 07:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fe60feda8696ad0025040dfdf1e3632 SHA-1: 1f2e8ad51038ddc15405eeaa135acab8d1ed072f SHA-256: 29948eb53e495fc13020f5e17008f526fb096d39880c42b9798c811a057aecd3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains including compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=marketing+information+system+pdf+download PDF link annotation
    • https://coopinproject.eu/ckfinder/userfiles/files/58145946713.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/53944230354.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e246a587---tuximunimawilonapiseriro.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/26585109250.pdfIn PDF document text
    • http://area5srl.it/file/31298406637.pdfIn PDF document text
    • http://inse.us/uploads/images//files/zirobeze.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jugatobuvesodaxumosuku.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/97087280855.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/fadasawoketavu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612733317fcab---11603415503.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/87858348083.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfb3d5ea9---66967582121.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/mnb3rmttkoq59ke85v2ksaab8e/rinenurure.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a75eafe71c3c309e804adf87ac0e9c9c/lixenobopoporolepujedimu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/30jj2ueaa1pb1mubp6njiu4f7c/70145585160.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/94466471582.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/perijago.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lisodiniwulirepovo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/momunolojepofiminonejok.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/d2u5fk5e5aigv2hb2ufqs8fhc3/tunofotizad.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/kafirevulitigataxate.pdfIn PDF document text
    • https://istanajp2.com/contents/files/39054644641.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9f5134acf5457cebe7dc09e74468bf69/momogelew.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430235330919372284.pdfIn PDF document text
    • 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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 17092 bytes
SHA-256: 2f0d75011334deb6bd60532605a8c27208d333e387562322ed376451fdf106e1
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 11128 bytes
SHA-256: f3a94e07747018563f4e625a53e47dd9846370493f56f44ca5c4e4e3bbebcb68

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