Malicious PDF — malware analysis report

Static analysis result for SHA-256 54728f0cfbb6f240…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 04:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7d63dc1a3070a784de629c54e34f639 SHA-1: 37a61a1901579bc7d2626f2eb024f36ff63721a5 SHA-256: 54728f0cfbb6f240fef975170607321be5ebba18867f52978aeaebd0009e4221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious content distributor. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous external links, some hosted on compromised CMS uploads, suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://at2apigroup3.com/contents/files/zorevokomufado.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1b4ba967edc9494fe0e89c0d32059e7e/kusumawoxovumaf.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33998824828.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vamonudafegutigulapuje.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbedbac5101---46253686772.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4e9e8e35b---ratinurivim.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2cd79f1bded2a587a7fef9f2d15b63a0/70197446840.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/nilokomepudelenas.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/45291279246.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/tisafenexogovibefiduro.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/aafab1945bba0db1f0b408d52e6b3399/69071733583.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/lezoxuvadevugemaxavetamij.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/144f4a8790ee856cf919ef37af65cf6a/lanufavijosutelepaguravox.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vnmi57nvbglvn3h79svoi4io81/jotixif.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7519ac856---genuxoxupiza.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d57340ee---jegezobarifibin.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c7869ead---lowobozeki.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rfunbb90tpimeao7kudsqdsfp8/mevibupojisuzezelipozi.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/84710137198.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c96b956d5d32d45a003c805a85ba68b/52940082947.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nm4ot61dncpdb38cthfkm0603k/javesokilisupesam.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/71446266892.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c833f1e5---kojidejom.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d052c3010---pezinubuwavev.pdfIn PDF document text
    • http://katachizu.com/img/news/files/bebikiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=relationship+between+sociology+and+social+work+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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 11376 bytes
SHA-256: e44a1774a7525f8994bdae63f2894ebba9ace0308dddda892e8953cc57c70481
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 17680 bytes
SHA-256: 70845c9aee310ce91fb958db618876a947120dbed7510726a6f7977ae21d920f
font_02_sfnt_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1