Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59f2249f45662fe…

MALICIOUS

PDF

118.3 KB Created: 2021-07-07 19:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 04644459735b92a7ff8000595a729188 SHA-1: 5156220b0d8d7fe954cbe6acfcc6824e1907b8ce SHA-256: b59f2249f45662fe2fd60f585cb0b16a5644dd153d33e4dbf20bc40465e77903
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://pistant.ru/uplcv?utm_term=laudato+si+meaning+in+english PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42f95e729---wutaxi.pdfIn PDF document text
    • http://absigorta.come/file/sevar.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/fabowelozarumiki.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79b326d05---17983332001.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/56649846549.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/juletepe.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f98q6pd5gssl70eoj28uru9kb4/85653803422.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f63a824b---kejeluzolowatomazewewa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b079fed---wonagesuj.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lfujuu9r4u9d2thbkcffnnjra1/xiwerivofuve.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/xotikile.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2i99os8reg3q7ji919hsivc66f/19351492840.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac13d2a1a28---78785710745.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bt5rk1vsmh2tg4kle290nddki7/8289845464.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608045d326240---wazovab.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081252d09a54---45079383822.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5f141a60---29208329852.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/odhqkan4p04f0j0ctjc7aatdp1/powunedumoxejawo.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/senufobazegutiwunuregize.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/82c6vbabvbhqboljf5h1oiuhq5/jewaravogap.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbeee2bd4---mizijujarapuduj.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ad23617330b415a12cc75a0cf29ccdc8/23707437377.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0aticv89p4mppea15h7n4iv7dr/72802347488.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/17540772800.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f6b07b0fc368762162f475f33e095255/91838701542.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/rixovasagezexadisap.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_off00016979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16979 10652 bytes
SHA-256: 97af7d392967f29ce91704d946c0de523d9dd60690630312373f2d24863bda59
font_01_sfnt_off00018164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18164 19544 bytes
SHA-256: 7785211ae6713634462a34ec6cedf9ca459d5ccea7a4db5b4a0ee7fe1f17fa53
font_02_sfnt_off0001b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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