Malicious PDF — malware analysis report

Static analysis result for SHA-256 2263fa6538369701…

MALICIOUS

PDF

89.4 KB Created: 2021-08-26 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c9bf8dfc57d4f1e62b833af2b7638d8 SHA-1: e07ec2a2276b2e2fc0a82623dfabed0b61ffaa37 SHA-256: 2263fa65383697012f41de4734bbb1808d21121316fc2ea58942018be5799f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external links strongly implies an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://ketchas.ru/uplcv?utm_term=how+to+bind+mouse+wheel+up+and+down+to+jump+csgo PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2563b0c4d6---56274261786.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/88128019114.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/389204445.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161050ab0a03da---vulufan.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/45099692890.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9068166a19702e0e4075d0ab08ec030/muvidelipemitebafitan.pdfIn PDF document text
    • http://emeat.ru/var/files/boninawasada.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcd4b29f3---linavakisebegi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dee5735ed9db53cbdab06c5a1ce96c78/72429780990.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8118e13aec6ddf9a786dfa466fe608cd/47341382738.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/lujosozesafejavabiguj.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rogawiraf.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/20217489740.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749666d09bc---bidarevexi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b67c1350d---27756545574.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/falulixufutomaru.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff54ab5928---puxesokudebonozasogo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/66522366754.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fixolotigoma.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/lunisokelimo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43b9306fa---35188131089.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77857c58af---38388390687.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/52462070192.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d95a105a---juxuboxanodatowip.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/xulabibakizalefam.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_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 17104 bytes
SHA-256: 1dcddc110619d4c9c41ece81430b3b668ee69a308b018de27500b40acb259644
font_01_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 11308 bytes
SHA-256: f7dcbb175640041bea498ee42913b3522ad8ed2b06f802139c515cf8116c8d45

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