Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91f505dfd9fcc55…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 09:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86b6f6d207d181ed18b2bd0b90b3d163 SHA-1: c02c8c4679f38b2e81dc2e202e3efa53932bb8b2 SHA-256: c91f505dfd9fcc55a87dd4c306d2d919d98b7cc802ed89ce66cdf1a1924e3e92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely for SEO manipulation or to redirect users to malicious sites. The embedded JavaScript may be used to further obfuscate the redirection or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=turn+phrasal+verbs+exercises+pdf PDF link annotation
    • http://pharmabiosolutions.com/filespath/files/20210905155756.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c96100251---vovowerutup.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vosejejivoxevu.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/tekiponunivelugoz.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/woziwiwar.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af412329e9---lapurobawej.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4eg90hji3ue9mq5loilun58eun/rejimeki.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210831213125.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9p53m0fhk54fg7unsmobqpnp4g/795246331.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d28dec4f1---37186838594.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ea7cf2df---18959992963.pdfIn PDF document text
    • http://dsfly.com/uploads/files/sunemodal.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/pobofixavasorir.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kisur.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/45110961036.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/6d7d9e1eef91838bf1722428eff67af6/xabusubobate.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/77754020268.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/letokanepefikurerurezusuj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c67aa0dd---silojigapaletexi.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/totipitipa.pdfIn PDF document text
    • http://benrassam.com/uploads/files/968400025.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/pajozejivowego.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/52441024355.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/35744699544.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/lsi1232jp28incisebmh2vled0/jomurizajej.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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10868 bytes
SHA-256: ad1783e80522b5d58fecb3f1b5245cc11b5d78647cd286fa9c98f1ab47a3dfa2
font_02_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 19816 bytes
SHA-256: d2b051b9a0360c12635f30790a96ff90f968827b0b2e99b039dd470a17791806

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