Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19c305da20809d0…

MALICIOUS

PDF

161.5 KB Created: 2021-07-24 12:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a52421320e1a23a8758d1a1757eaef3c SHA-1: 4a70106945a65d48de67a8d681f16cdf36f5f3d6 SHA-256: e19c305da20809d05c4f6e555e3741f976d218781be30cab3a88bde131dcc952
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL findings are sufficient to infer a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4a3598307f54274899dbdd78a0cf41bb/xevuwukepojajatetudazab.pdf In PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2f81debb045259509133be2781b9156d/vukujino.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/koruvod.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/87261742439.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/solclegin7990pfbq8lo0cq1v0/40187475703.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b1ad7arahn0v8j0u8f5eva2v5n/vinutop.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e2f57fe9---88851008893.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pores.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fdc062ff5c69307f14648185530f764c/87360901765.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/fnha6ln1s6ftervok0fed22kpc/zabutalemetobaremevibexoj.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/92259089942.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ec5e0f0fb6d4e65e5d458a16edd31f2e/jezeduzoxumelaroxope.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/74ef776526f08cd2afaf6d3c2074755a/25124324476.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/122asdc00bq8ntsanr5fiorafv/butujivivoniledibux.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ef5651fd806f044c9de56837c125617d/kijubivexukezari.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3430f9c018---57092662715.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/14967320349.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/pitubafovulozuze.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/zikufixonagolemixanasexuj.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/82457372308.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd9675e21---72899419809.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/44837974795.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b48427a01bc---63814238836.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/68094465851.pdfIn PDF document text
    • http://bronia.org/userfiles/file/diraxirosorexuxosagite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+there+a+n64+emulator+for+3dsPDF 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_off0001ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20432 12220 bytes
SHA-256: 1a069e76eaea7bdc9c1a13d8b87d9f4a020159be532b0659717af66c9d88bfdc
font_02_sfnt_off00022bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BB1 19128 bytes
SHA-256: d762b3cca9aa02ef0e75cec31f8f11e1cd77339d330c116cf679859cdb87985c
font_03_sfnt_off00025de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DE0 10996 bytes
SHA-256: 1a984d5d8c1208c99594d7819c5cd501cff34d60f6e8b59b8ebe6e201782798d

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