Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8fbd6c4e831370…

MALICIOUS

PDF

106.0 KB Created: 2021-08-22 01:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9df2e844745f7a096406f9f62ea9128 SHA-1: 8eb5e5f760dc389a2f187ad898b1d12a3b533352 SHA-256: 5d8fbd6c4e83137095d34b45d6388754b13318eafae892ccdf795ac1318cf2e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://immobilieninvestors.eu/userfiles/file/nopev.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b3f63c99b23937b4816a7933eee95c48/28678866913.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/vabidedanilegupevakisak.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/16091409147.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/muwubilupopije.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1610e39729d970---jetofolojepokozewej.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/sekumuvigikitovugadugaba.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d80b56191c47c2ff0309082a96c44b76/jofabunuxan.pdfIn PDF document text
    • http://arslanemlak.come/file/81310903666.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/45858630339.pdfIn PDF document text
    • https://agatanorek.com/files/file/37235744912.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/n37ca9c65v49b1qqb38ejt4433/29672984561.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/41552740076.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zivagixivimosiz.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49229590933.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/71569389718.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef0a4da90---20853825947.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gilikedemuzowunowovaroz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/d8pg29f1382f219joen465vo5o/90272888311.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ac23dd806b96ecc47107ab6c1e2eae13/legazimogadaremefexuga.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/dezipowulogerumikukezes.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/33989229689.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/zutunuvisoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=plants+vs+zombies+pc+download+full+version+rarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 17756 bytes
SHA-256: 27a40321e5fa4876aae6241edd6f4e5292868dfa44ed405efb0e7aa2994b0293
font_01_sfnt_off00015182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15182 11236 bytes
SHA-256: 03f87cbe2750e3e8fa6651799d274bc527b977ba4a4949958c9d4eb425316bab
font_02_sfnt_off00016bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000183ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183CA 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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