Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c55ab03405aeca…

MALICIOUS

PDF

115.5 KB Created: 2021-07-02 12:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ead51149219b87de21f544c2e5be893c SHA-1: 62ffaa7db0350a00b3b3822b4c5f4778e69140ac SHA-256: f0c55ab03405aeca6a380d83e02b77efdda248d0375e8c812367168689229afc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs pointing to potentially malicious PDFs suggests a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

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://cezanart.com/userfiles/file/dolezakasikisavidej.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9c40265a2941d0cd10bf20087ffe6e4f/dakikivo.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c11d2fe55---mutaroguzenobedazupiki.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pimepogimemugepipobifoge.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/49e47623b0beed373decc5d6fcfa6251/fusorixixifekes.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a71b9bdb---titanakulo.pdf
    • http://wurbs-hanau.de/userfiles/file/pakizawakolen.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0e6304a8---10439034487.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ad31a997---tiwebewisal.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b485b056f---melewozinavofinugerut.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/80p6ftnn39tpva4c92bugvfo3a/37699651618.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e781de73f---feginumelijosenubif.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/85170057773.pdf
    • http://kawoka.com/userfiles/file/kuzogefotomuwedinelexolo.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bccj7qhpe182oai9h5k5m4mchq/karigaxanoxibegomitu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71411cc29---toxekujejegaganep.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d4d976406830a2658ddcaa5f88dc579/rubowadevudedolagu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/aht5qo5ggetvfksbsagq6ogsq0/dabolenebiwirakerusopin.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4f232808---92158459690.pdf
    • http://aarogyamedico.com/userfiles/file/8886341077.pdf
    • http://interel-rus.ru/test/sites/default/files/file/muzuzabixadabijez.pdf
    • https://dvg.asia/ckfinder/uploadfiles/files/48413098659.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nfs+mw+2005+pc+requirements
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135b6.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 16092 bytes
font_01_sfnt_off00014afc.bin
6aa1a1013838674c1066db92241a77c5a5e7c54e9750709322952f6cfe9f59d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 10996 bytes
font_02_sfnt_off000164a7.bin
d0d2ed3a958e0f1284f8f2e35f356a271d11f4e30b15ba473ec86c9fbbf9486f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164A7 21552 bytes
font_03_sfnt_off000199ec.bin
cc3df57f80808358ec12eea98f57041b67e86d1852e0bf825fd18925e69a79d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199EC 2972 bytes
font_04_sfnt_off0001a604.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A604 16792 bytes

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