Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d03f57b99ddead…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0dfccf603fea1a760406ad171f7c31a6 SHA-1: 761476de5785213058c1b6424a25ffc63c3c25a4 SHA-256: a2d03f57b99ddead07d0df26b6b054130bb5d99092027d9d5b1dfd4a21177b91
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and embedded URLs suggest it is designed to lure users into clicking on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7768df0753---25764140793.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/02e8e8634588db91329b39fde40c56ed/54482139317.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/25287403397.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bb291a039a615045c8e9523db737dd21/80198454698.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944aa6c90e7---jenekenevorunifotalur.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nep575635g9h7a0nu6016sdrcg/90865667348.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608862985c1ae---53847320090.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a96281d8---moxiveg.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/50891608754.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d435899ba---45778761295.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/25871520382.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/pudak.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/gitibolusurumutox.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e50a6e70---lilemaxatupiwiwuvoxa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac728ab6941---juripevogowesofav.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/25b4951128cfd7fa36a8e8a24319528c/lezovujoz.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xefebofokubapu.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/lojukowulemizawozumurab.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7858d9564---62836190087.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/kunalezafasulezova.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed68d8c03bc---64394852191.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/regesosipobutoni.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a106c4ea---zomojibarapojidojepunomis.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55d5c1320---zovuxepatawa.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/40511616049.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070316caa756---21376110092.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609918793b5fc---zuzukajir.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f0953537f8766c98e97c67065ce389d9/wugomatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=soal+toefl+listening+comprehension+practice+test+1+and+2PDF 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_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 11312 bytes
SHA-256: 9d13363e0c3934918ded7af8f3c2386d187597d1e7b6d577c87c07d0545178ac
font_02_sfnt_off00013ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 17140 bytes
SHA-256: 3175330141ee22a0129a917adcafee083a92b9b380343c53a736faf0370dc46d