Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36f78bb3ec6dd5e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 08:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bd6052b10901c4c40e0258c5d4912af SHA-1: 183219294249938e1117ca1b98861ef688d0c763 SHA-256: c36f78bb3ec6dd5e552472c74ca43eeccf4fa3dc4b021dbeb4946b7a71538213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fullgame.hu/uploads/files/56386780706.pdf In PDF document text
    • https://abofahed.com/userfiles/file/75082141321.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tok0c33minrb32e86rdbr2te6m/5500149502.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///43306988322.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7e45c71f72f8490858a7ac46bbb63381/zojemixuzimamitusu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/derolovi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f8f608d7d15ef64897767a9a6b0e576/34155856926.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/63363313215.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/57973556786.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/77315695903.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/rojud.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29733eee9d---34287174053.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/totibatojudumemajiwa.pdfIn PDF document text
    • http://orem.mn/uploads/files/27813467745.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611645dd654f1---kimalurejepivirobudab.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zoguxumejo.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zozobut.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sapix.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/17953884283.pdfIn PDF document text
    • https://premium-house.uz/images/file/figadulirer.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xozagutenofowawobak.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zomizovuvokefamimesar.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161119792bad5a---rososupafemazodowoze.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16080342061c24---gikunamojimawerom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sintomas+tiroiditis+de+hashimoto+pdfPDF 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_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 15536 bytes
SHA-256: e41e450708223e8c9228bb5b2b9542af326dde4ceec68168865b6364013d5c4d
font_02_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 10792 bytes
SHA-256: 2c88d11c3760eacca18b19769c7c519f47e30de38d9566497dbfbce670cc8f90

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