Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3364b0853d6038a…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 04:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2d09afbb923fc18eb6f0f0ffccfa2b3 SHA-1: 1b848e510eeb88812621b67e2ff77d0bb77c72bf SHA-256: d3364b0853d6038a3d78ab175903b05c21331a3f5a5bde18ec7af38b20816195
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. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage distribution or phishing campaign. The presence of multiple distinct hosts and the use of compromised CMS upload directories indicate a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/74f41f8ea872e25525cad1fbd3de7114/vowivufitekugawateza.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7cdb0ab65efee91ea965ba90dcb74d95/34424613191.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d780789067b2cc9e9e5297b5d77b7cf5/81541388467.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ea0a28512---73025148284.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5710c253862c6788b52121cf06532777/jipatedilenisunuxo.pdfIn PDF document text
    • https://medtek.vn/storage/file/gopofubufolovifasolon.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/84b14b42c0f1ae0f4fb0ebc3921f95f5/58002590730.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///soxadekusamalajeb.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/52684069098.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4f7b462591f1815bf4442f32b210568c/64846968044.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f7772a5a---sosaponulibozoro.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/452931679.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1sqftn5p7inhf6s2amk3qb9e9o/sezosajagaxesikirolufasub.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/80107328769.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/caf839ce670380d804747da21efc9bc5/10753588573.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/46063902229.pdfIn PDF document text
    • http://acryl-bg.com/userfiles/file/basivokowixetekavumonas.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/69092877584.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d515a68---sodibigipadamugonadi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/mabuxoreredepaladokabop.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/02bacd3ff3c100b384811cfc7e5f5309/sutajinokijunafobidup.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/82051450451.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160803010cc47a---lavodumepokinavebabo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a587d5a349969a6cc92ab557055b536b/welujetuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=another+word+for+arduousPDF 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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 19792 bytes
SHA-256: 8d4d0b1bcda4d02081231063dd392653f92c5b4e61a8f87ceec25fa2ead1f855
font_01_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 10480 bytes
SHA-256: 7080f611611c4e928009cacffa7020bc05d0fd1f46a41448d46953d1d90846f2

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