Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ebe052b046124e…

MALICIOUS

PDF

90.6 KB Created: 2021-08-01 06:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 78430898ae40a37b412a2ad288d3cae4 SHA-1: 943b39157e2454c2c843de519778c063f989ba8f SHA-256: 46ebe052b046124e41410b09e50686fb318282f60ac14b2dfbab05551df4224e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a malicious invoice or payment lure. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and the invoice lure heuristic support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160887bbe2e24d---janikijalen.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f631ec8c1---sunasagovubogomomimusuwe.pdfIn PDF document text
    • http://dentherapia.hu/files/file/64575869123.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e8ssdpp4k0qslpe47oisrb223n/woruxefovegax.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/nonotigekatasuziju.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/39250407044.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f89e96a19---84675687025.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd90022aa---padin.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s3v895te3qd46clumcpfkkpqfo/zanerera.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0a7db959221e44b76ae2fa3fe80f7ac9/6840699237.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/14331115069.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f105d18129---giweneka.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/920eb0eca74c2e3edf33a5f3bf90ebbc/81548707897.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wobulowoxudabijomatibapu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1774beadbf---xoserubigomosupeno.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/62499238864.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/silun.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/765113fd108eacc6be07fc22d892cd93/23927657091.pdfIn PDF document text
    • http://iworking.vn/uploads/files/zapazakarabu.pdfIn PDF document text
    • https://andrejc.si/files/file/77488613125.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vojezejemuxitafexen.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2b2c9276---watusomod.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/62859631920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+request+confirm+receipt+of+this+emailPDF 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_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 17772 bytes
SHA-256: b0e4370a94d059577b42d8470e04cedc7ccc9e2d60785fe7522e93b9d03beebf
font_02_sfnt_off000141e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E9 11068 bytes
SHA-256: acfaa8a3191b5259433ad6a1906bce174b7770d24b78d7148775e1bd54b1c9c2

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