Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f686adc37713246…

MALICIOUS

PDF

127.3 KB Created: 2021-06-28 12:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23845bea32ef49802c6fbb303141baa3 SHA-1: c38764119484837ee7634d18c38e61d5dec1e494 SHA-256: 8f686adc37713246d4b1511b74386cefbff3425b97fba297eae1e86ce699ece4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The numerous unknown URLs extracted further support its role as a distribution point for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kitapkapla.com/upload/ckfinder/files/ladevavoxapabaregipizi.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/vaboputoxituledonesivilo.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/87584297725.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f75984835---96901625240.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f5c840950---winidu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/aa9f1d25f3c8811dd6b84957b3bd53f2/96492664927.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/79338627717.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c774305fb8d---68960254315.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/1800952504.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/batojogonumex.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160747299b6dad---dukomalifevosamevagu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/to2ep3oi02frdggbm6ccefm3sk/buserumizuwuwuw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a426a0cd3cd---juragezeminisamumawibod.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///4601302318.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/femefik.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5fbdc256357774d5b7ae1a7772b2c532/49946423075.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m216gvtp74ka3m77ebkui7keam/96296047478.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/fizod.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/volonepazikagogikibad.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d7d18c0---93413162324.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e21r69mq1q440jhmuumae8k6v3/38137070364.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f3b53bb6---6757841402.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/15200675047.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/76684060009.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/zetifu.pdfIn PDF document text
    • http://jucal.es/images/file/rozat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=two+examples+of+connective+tissuePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E0 10856 bytes
SHA-256: 545a5764ea804aa32a247c55e81d7d7b875c2fe3286ae0b3ef92658b538352a0
font_01_sfnt_off0001aa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C227 17244 bytes
SHA-256: 5dd6fe723efd2893767dd4ab4921de7938377f603d4ebf66f632ea34bf8e0244

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