Malicious PDF — malware analysis report

Static analysis result for SHA-256 c763b5aa6fbf1fcf…

MALICIOUS

PDF

87.8 KB Created: 2021-07-09 16:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f89d6f2ca725058ebfa357822c8dcbe3 SHA-1: 26eae321bf2bbf1748b7c0a6c86f976efab01905 SHA-256: c763b5aa6fbf1fcf61d7fecfac678974abaec1e508e0e0c63cb4716751f170d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=3+tools+of+fiscal+policy
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c8f5478bb096c74784195c9ffb373e0b/mufuxowetefagij.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/11254457374.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/66579180962.pdf
    • https://bititechnika.com/uploads/file/56052445416.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7ac4d40a---vugiv.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7funavo1k3479k4v7f3qhbq1v0/43149671623.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3298d24276---xajalowefapo.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded4f8504f---78106317140.pdf
    • http://studio-castiglioni.com/userfiles/files/45044158752.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f3ffb2bae2ed07b6bd423d29131acf3b/79039469282.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/65182675031.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983a3f4db96---84591686451.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210612101315.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ivi3ps9kh8esbq4uuieoss8pn7/belakifivedunev.pdf
    • http://humanitool.ru/userfiles/file/73487330054.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sdqfu08n04hldpada3qjcocgf0/14123475558.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995a55df327---30666108851.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2346e449af91a049863877bfeffee0a/sovewufinatimofij.pdf
    • http://anthonyvienna.com/sites/default/files/file/80035843250.pdf
    • https://euroroma-bg.org/files/file/kagugaxuvof.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160881da9629d5---wibepefetenufadibamunezu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d69319d13---34682956533.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1064bdc49---52990089091.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b07413d3e6---vunosek.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/bbbaf9ecd4209d293b4d6e2461b9d0f7/runilezeronogufanon.pdf
    • http://blessingsngo.in/userfiles/files/74140456310.pdf
    • https://eobliecky.sk/userfiles/file/zemajulimumorulejus.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f664.bin
ab6fdedb6feb02867eba7a12c27ccc57765d374a780a0876012406a23f74c5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 16864 bytes
font_01_sfnt_off00012245.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 16792 bytes
font_02_sfnt_off00013a5c.bin
35480718d1eb4c71ed862bf3fffd32fe091590e03a06199c3b4b8498583e6e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 10324 bytes

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