Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d003c12aa136df…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 00:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 874f0a70d48b5bb852d8c53bcf1a380d SHA-1: 4fda83442b47413258aacfe2a34436e88b3c8885 SHA-256: 89d003c12aa136df35f122844d876419b7474cce4797364ee814710ad5f92717
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs pointing to potentially compromised CMS uploads and disposable hosting, likely to facilitate the download of further malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://twapp.freshkon.com/upload/files/4112990786.pdf In PDF document text
    • http://year-c.com/upload_fck/file/2021-9-14/20210914023755374620.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021962120378739.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/rigadodatisagojunuridover.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161410d62a82d9---dudepaxusifazokab.pdfIn PDF document text
    • http://novichiha.ru/pic/file/60230319626.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/73574652409.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/pedibafediravutotefujezaw.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/likobuxebesidofolaf.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd179660c---dumutases.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/baboxavewimegoler.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokinivon.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sesugixidaferixaki.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/10395981290.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6571cf49e9e08149af0dd08e73b8b3c2/16933187981.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/zilasevorazulokero.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/natiromupapogekemedoguvab.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/donuxidal.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/sadavovozemefemi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/98405352935.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161330428b8c23---17206338527.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/xanopikobewakonirotizu.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/79009979768.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagedazarosakegikewulo.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/76763439499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=punyalan+agarbathis+torrentPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 10740 bytes
SHA-256: e42eb3233d9b5c4229a317887bc48ea0083e64482422475bff3d2bbefe981f16
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 17276 bytes
SHA-256: 95dbc13108c83dce23e55abd9c9211913d4561080aee9b2a342e6e957e65b6af
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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