Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f9fd50b4b822a0…

MALICIOUS

PDF

113.2 KB Created: 2021-09-19 19:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ff6dfe80cbbde30256a614477532ec8 SHA-1: 1d4aba52bab711a355fa57d65b91a2c1ed25d12a SHA-256: 52f9fd50b4b822a051553c4ea3bef7ec41b7c192ccf57db92663dfc2ac44f8d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://synerhu.ru/uplcv?utm_term=blockman+go+build+at+sea PDF link annotation
    • https://coverline.ro/userfiles/file/gonirizepete.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gofosumokuzadikiretirenov.pdfIn PDF document text
    • http://staropolski.net/Upload/file/suxutokuniwe.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/furujedumaxusurululaniwoz.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/34612673131.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/laluguxex.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/finate.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f688634d1cc39b879c7ad029fb5087e/bigezakonobune.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/lizubobasubiwuwavi.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/xarerulidavaxex.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/tokaxejafif.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/suvawitilolifimiv.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/mavewewozep.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/85044605814.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/notudi.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/6990443465.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07e1ae311---fobalurilunometelosod.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/lisamamaxero.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07cfedca1---18831913777.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/buzubegulogajije.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/56134997542.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/81339548628.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0ia6a9i9t1h3c6pmi33uli3jl5/gajugezerogagafuraxojiv.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/kizozerolokelixem.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/48733902163.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/vomemomubagetadidimegurol.pdfIn PDF document text
    • http://foodchemsino.com/d/files/54233610438.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_off00014ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD9 11000 bytes
SHA-256: 8171e4cb57b721faab5e294ec4a77249d18d2dafdd6cceefe4664bbf7c1b480f
font_01_sfnt_off00016440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16440 22308 bytes
SHA-256: d1f07056b58e04190206140339291de446715376678fba8262a7c4f82952d240
font_02_sfnt_off00019e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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