Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5299e9ee494fdb7…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 20:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0092160d314d3cafb3bc67c5eea39e45 SHA-1: cacc161a2371e45bf1c64f68cb694d1448628ea5 SHA-256: e5299e9ee494fdb7855407ffb182d942e495f71df14c3401473fa73f2288e81c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a lure for invoices or payments. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute a second-stage payload. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ketchas.ru/uplcv?utm_term=proforma+of+purchase+book PDF link annotation
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091f237be3e9---70951332604.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l5r1dhfad41n7gjp6e8avlpbdq/65454899963.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/gofibufoxiposabi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ea037bb8c80a996721cf08366e3b18dc/ninawevasulipufimarekutom.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1410267bd---doropevusavinisu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4fb5660df---zisolusososudiligefos.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/39al30mks9e94c3n79uthuoqn0/80011570882.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/59764174983.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49pqj9sore1etraosvvokhjeu2/nenojawitomikaxorul.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68e6ea988---rulezixojewigewuviporoxi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ibd2vbpb65rvl3k6jnrf58egi/1537144198.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/jawes.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098475fb6d5e---49944674014.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zazage.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qsooiag3dpqd1vn63j6gbg4jhf/71779592625.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916950be2c8.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/reriz.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/p7glh36i76132dmh12anj3qao1/savenovisexes.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/tawofofewesalux.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e74557a18---xewiwigigujajidatonodufo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716241752de---50089773551.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/rugunuwilajazexobifegejo.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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 10740 bytes
SHA-256: ddab778a89c8b04e64760d13bd6589e04c4deb02cde523c130c25c6d15044215
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 17792 bytes
SHA-256: 6783fa534422ebce1dcd841aa49032d6dc06dc7db9f9f39a6c530f65d75d34f7
font_02_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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