Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2de279890581dc…

MALICIOUS

PDF

100.9 KB Created: 2021-06-17 17:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 75f9ec122275f03bf4e99deb0eae2c82 SHA-1: f76e7e3e26ba59e7bb1f354425ca3929e9f562ed SHA-256: 7d2de279890581dcbf0536a43d8668167cc7d36215626a1d30932b4b04c3d1c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608983e87cce0---6763238321.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8493ddee2f4d9b783833bf4cc04f8256/75045112153.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/19405622073.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/pezunalefefe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4ad7ac6f---20099487369.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/rokesenoluxed.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/50518620776.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ont0h8jg3shcdvhahab3ls4epd/97311625997.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/392jnbd4i2masrqe8ken7gkpk0/67600747221.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/33822713235.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9708b73a---66899492760.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c16fd58b4---75200741009.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47db7b6b7---47117767855.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/559a6b9affab88d5b72737b9a8342d51/lemulosasalap.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8aee213e---sewuguvugerafi.pdfIn PDF document text
    • https://isosklo.cz./uploads/66829942982.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6a1adc669---pafozavifokotiluwekam.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/595c447e6862c3a3f152fd6cf9e41283/54057181851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+spins+on+coin+master+without+human+verificationPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 5332 bytes
SHA-256: 8b6d3542ed0a47c2c6771ed43915e6f3afbe4c37d705341d44771ccdec9133ee
font_01_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 3572 bytes
SHA-256: c3abad425980e21a377fda8d48d3f29c23a62af906e6c06e35cfde7d251d5017
font_02_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 11692 bytes
SHA-256: e20b1f3cdbc2bc102f1a4d9718ee6143cf18b3fa5d7f3ab6f5a4a71226f3144b
font_03_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_04_sfnt_off0001752b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752B 4236 bytes
SHA-256: 77d63a92a760a2cbf2598e1faff62743ad7e4954867b27d4af5a4705000e9349

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