Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d28d484525a6d8e…

MALICIOUS

PDF

83.0 KB Created: 2021-08-30 14:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5135aa1c2262a85d2a3ec3ca8e81d9d SHA-1: 8c5b453ed4897d0fcfdeb49915fcf1d5fb7e9862 SHA-256: 9d28d484525a6d8e63dfe31910683807e9d09859cd07fd9ccc9f1c7b3ed17d0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites and disposable domains, suggesting it's designed to redirect users to malicious content. The embedded URLs, such as http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdb59601f---52977756142.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3f98cae091b8a0d1b7522e43f128d1a9/11222475741.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b4ec55a7c44792ebf4664eae2816d0f3/76316836287.pdfIn PDF document text
    • https://tonitomov.com/picture/file/3856285219.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zumizulolujifiwiluxivun.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/popomoloti.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdb59601f---52977756142.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210624124859_0oy3ok.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/semoxijimejizusavosuzi.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/febefiwufozariwusodojig.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/042495757e9109935336f77354a26fda/22172487947.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0145cbd04d---30060447309.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/kubup.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82332227156.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/5422743229.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093e52c4150b---sigulejurebesekug.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33f29df32---40920141227.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/zajugazuz.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6bcea5c138adb9b2e4ef9b1446708546/sudovolim.pdfIn PDF document text
    • https://subarini.ro/mm/file/novizuxuxozal.pdfIn PDF document text
    • https://foulardfotografando.it/file/17275941068.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/77947f3582d7fd2aec522e57dae03783/negulojopumek.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607293e30b550---1754304798.pdfIn PDF document text
    • http://gojjang.com/uploads/files/rujalakarek.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/74724749545.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/nomifibumapiwivesoxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=noun+exercises+with+answersPDF 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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 18292 bytes
SHA-256: da513aa0b5b87be0b6052fa4a33dde71079705441a9dc1f45d988685022f6aaf
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 10548 bytes
SHA-256: e873b0b70d9e6fbc46dc17a86e88739958dfccedc6d72af620cbd5286afc70ca