Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b648b3d1f8a971…

MALICIOUS

PDF

73.8 KB Created: 2021-11-13 22:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b1ad1aadd28bec7f433b8835c657cb9a SHA-1: 6b10190e2cb35516acee63b5b520bab074d9c158 SHA-256: 88b648b3d1f8a9712e3d56a0fc467aab7224b6e4676fcd535bdb46b1e8fa5059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=waterflame+castle+crashers PDF link annotation
    • https://hotelpancharatna.com/assets/userfiles/files/paramelaminavifavuzez.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xezexowesuwufexurasej.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/kusadekolomaxakiwix.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/48060714270.pdfIn PDF document text
    • http://hijoin.hu/editor_up/7328710499.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/werigevufakagamebuzef.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1618fb3242d3d0---48485494580.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/27707935324.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16184fad4b0614---zifareferisawur.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/48806271714.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/tutatobelakoxiwawinigamul.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161893283d2677---76089089130.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614560c2cf398---pufenekoguvoso.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616e947860e10---48385350433.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/msro7u6mf01js9po7mm9c8q2m6/2925768974.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/43431803775.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/71267781524.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16177a5c661aea---xonixogumadabatijosa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16173c0bc22321---gujadatefijisek.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/86205324084.pdfIn PDF document text
    • http://limoride.net/gallery/file/50038860852.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-1/20210901051624873775.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/97819340388.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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 18016 bytes
SHA-256: f7abe55633a1ba4a0edea11cffa3fa2f73191b2971fe03c52b74ec36778d84b4
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10276 bytes
SHA-256: c49a60cff0d739b8ad8aba99a028a0489e547c9550193db7a8b148001e9e4572

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