Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef607e87d47087a…

MALICIOUS

PDF

153.4 KB Created: 2021-06-26 12:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d214f5cb1c86503eef04972719c8086 SHA-1: b07f843efcf8a03d8509bda846e25bc485ab8130 SHA-256: bef607e87d47087af4556fa7473292246d4d6046d1e1c73c8cc537ac7f765a26
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely intended to deceive users into clicking these links, possibly for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 7

  • 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.
  • 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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089707402e4f---34326346146.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c3kotqmnuhn9c0o6lsuj3pfro/wuroxedobejediroxij.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96b2efc5b---79549578605.pdf
    • http://netflor.pl/upload/File/1304890086.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ovb757nc8u5392qqju96ie7o6/sakavotumifisomivazijifob.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f493544394---guramozax.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19858d97c---60191398314.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ada9de33---60356920012.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb2936ae7---majirofuwonefa.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1fee98afd---19075108678.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93eb216ff2---48497934137.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/165c493db625170c4ec1a3c8a5d363de/xizefikenuzokive.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t9v9bgiu2f0u8r96q53o8sto83/kazomaj.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607746ca8dc89---13190115003.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a22a94cb6e36efa26faefdc042a8f6f/97850588597.pdf
    • http://meadescafe.com/userfiles/file/lonowafut.pdf
    • https://landbar.com/upload/files/rebuve.pdf
    • http://hb1004.com/userData/board/file/xidofazebozej.pdf
    • http://superpart.com/files/8544651956.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/82effdff54de18d01cf7904d74bb2a1d/55178525105.pdf
    • http://tokyoto.pl/UserFiles/file/kajevefenaz.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mtkjej7rr54dc1hn02mnv93561/zasofiguvanulifefe.pdf
    • http://bright-mineral.com/uploadfile/file/2021052016545229.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=intermediate+accounting+ifrs+4th+edition+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e83a.bin
087b90be13d838b5989268e3ef641fd17df1f5e46e0816d6cde318d0a7848cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E83A 18224 bytes
font_01_sfnt_off00021883.bin
8d972f3c15f59ea726788c533111461ff5850533c8838f2e85bf9e72331c26ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21883 2620 bytes
font_02_sfnt_off000223b3.bin
2593b5b14ecc12c27b3a0a582705f34e2d1181504562cbd5747cd244ab63fb84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x223B3 11092 bytes
font_03_sfnt_off00023d47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23D47 16792 bytes

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