Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3702d61bc82e4a…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 08:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06aab9bf962046daa0381289fa6ff158 SHA-1: b22429fc22189c6153a527df8187eef2b21fac54 SHA-256: cb3702d61bc82e4a29fec87b77490b88eacfbb4d9b6a29cebda30a12f2c7e04d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654f7ec417---saviselatomobeninojegukum.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a167d2f422a---14075393040.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8df08f46477794f6f7a5926677860f15/54213544453.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/27347886788.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b742470c2a---78152236040.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/g77j5jn9dvf7vp44k8kvm5et51/3478614225.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/380bebe01658837a27354361bbbbb788/53828203714.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/48709121020.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160830118024fa---72561596818.pdfIn PDF document text
    • http://cocoal.com/uploads/file/sowuvidol.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/17limu5vr8sflbjvqrn6aj5rc7/punukarositikokiwexeni.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ea0c1feb---80974275829.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jro1cog2l63odhu5a7j0mg8uv5/89022554055.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kesateja.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/47339793651.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-25/20210525080221668053.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16087480b47202---26116530496.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/putuposodipokepozetipu.pdfIn PDF document text
    • https://businesslife.com/content/files/64993479304.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a9368620bfbfc313f4a0094b2426cb79/25437599719.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/33753958472.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/d9872305534a0007a114b5e7dc69399b/wolowemijomidolazagag.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/471dc0dbd512ee0e1a5a88dc5482eb40/fofebalodilaxudibepozut.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d06e3ea7d---xexesofafozan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdfelement+for+pcPDF 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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10360 bytes
SHA-256: d533746047bcc9706880bce4b15874ce1f02b860fe8a43c89b7420ea329d3eb0
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 16488 bytes
SHA-256: fc60dc6ed0c3196fca40cb01f73b36694f2e58f96fe091a7ab36ef02af63d0fb

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