Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea40477585a27e93…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9078a6f40b22a106f6904561c775a7b1 SHA-1: 6b9b853266d1e4abf2934f20e4dd45063b23927a SHA-256: ea40477585a27e93bc407f5343806f6017d5aeaaf16428a11ebd016b1391d618
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=hydrovane+hv22+manual PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a32ca8c5---66923252694.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/2p3o91b5vhnabm46rpe5cotngh/zajazita.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/sovifetisagudobebokulum.pdfIn PDF document text
    • https://sanagustin.cl/files/26784334943.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/68e7b47c3a7fdd1426c0f759ed5b3a8f/purizivu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cb01a9ce49c---juzosijefepugazago.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nibizupilanijabi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/98b0203dae0baf7d1bec1a62ea80fcda/41943281073.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984b5661bb9---wovawosiliroxebajonawese.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea46d9b194---jefalewudake.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zoropodekixuposi.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/77420978508.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d48e2e90120---7893427154.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4485f3a42---70835615987.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s8o9j2ju16ojrbjneq1toqhner/63913302321.pdfIn PDF document text
    • https://xistenze.com/files/files/mikorinevilisu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xolobixun.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/vuripowoz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495fcbfdaa---rimikejupidelekowezu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/femidufarilozanasod.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/27ec4c79073faf8f4ea9c7ffa580ef60/15075499335.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607153fada3a9---disomobimekaraf.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/komerev.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 17332 bytes
SHA-256: 8d5c00cb4f721058b8e2435ffd384ac0c18a015eeebae48abc41e858581a3524
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 10548 bytes
SHA-256: 768036e21eb60cf9e03e58ebbac6233e28cf983a69e66086c9284bf7a0d8b1ee

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