Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b3a65fb91ce71c…

MALICIOUS

PDF

106.7 KB Created: 2021-08-22 00:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 597ca1602f59ce22e752c9a92eeac0a5 SHA-1: a6681a9f7d2d563e21af9c2d5446fcd21a185b81 SHA-256: 48b3a65fb91ce71cb5c0e529d51f57583cbba749562c3dc13eaf00dcd282977b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking these links by impersonating an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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://adabaskimerkezi.com/upload/file/92161368676.pdf In PDF document text
    • https://bbox.ru/images/shared/file/24479023664.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080240827bd5---17121685713.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/46d482857f47349c62560ef36835a80c/67034620780.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/golugomevab.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/71689754969.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4dc2b1fb6633b87ab23e8802d22b3596/netulusaxalime.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/95336466849.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/latitadi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a11e904d623---rasalojidejor.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be5238be1f6---22105998460.pdfIn PDF document text
    • http://gapp.fr/medias/files/92947774799.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c3f88131---47590014768.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/37540438158.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93f575dc65---45184391097.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efedf71f66e---93807360771.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/27626039085.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9ec13e009bd48d3f269d04af8eaab4cb/23566317657.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781890fb72---73748290087.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626145609437820.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fakakofedutijoxuzisu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6ad443aec64475689deb6c189d312a8b/kukopunaxid.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kub2ao46pt61ej67emglltcrad/88996227577.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/37712022710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=systems+understanding+aid+9th+edition+solutions+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 18332 bytes
SHA-256: 69a5dec7ee2376e080ff0f89506f52433ea8f0336f441021b25e33f9c3a2ea7b
font_01_sfnt_off000150b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B6 16728 bytes
SHA-256: d506a56639183fd898cd2ce8b4936979a2900d377b6d984a4c428b82db6a9458
font_02_sfnt_off00016875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001808c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808C 11400 bytes
SHA-256: 84c4b35bd929094df0d3344befd239117aee5f2d64032af68b009c2570f73fa4