Malicious PDF — malware analysis report

Static analysis result for SHA-256 9491db0a1f28fe98…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 01:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7cc25bfdc951c9050a6c299ba38f14cf SHA-1: 1ae06675103820f271f0a1d2c4df611e5a1eda76 SHA-256: 9491db0a1f28fe98a282e4dc0ef91405dba3660c1df45b1bcc1ca4e014f9c829
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://gyobel.it/public/file/36554364230.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e1860761b---56083911609.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160793226c41be---50697542632.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/kajutiroxilok.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a459387ba0e21f0a85b590e83222aa3/kazerabowewajunejorugena.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/979831865.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/nidesenubivoguriro.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a6ab8004---doseziz.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/79260092510.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8de0bb8tiolvsonjl8smdb2m1f/mugojunirazupapo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/27c33c5a0344dd59c1b8dfd3e33787d9/wimiralegajilunexudobag.pdfIn PDF document text
    • http://industrialdevices.in/uploads/68960988339.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f746eafb1---tixapuwimegudum.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a328ba4ba4---31035984352.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c66496833a0---zitudovevijibezupibo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2f37bf5ce9a0700ae870bd30bbc58ddb/vinumubetejaxomopirowu.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiiotjli4ti5d1glqee921tqcn/disajofusekun.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaca5e471b---65273280500.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/22137194219.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/mepomebokufabezuziz.pdfIn PDF document text
    • https://ghnservizi.com/file/41348064825.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b29be870---geroratarufupufuxutuzafav.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/komisolotedodefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hammer+mhw+guidePDF 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 10336 bytes
SHA-256: ca565aef4a0132e32ac4b3332a92d9c65629e0e094a60288d61d9ec26138dd02
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 16172 bytes
SHA-256: 6f4a863c53d7ab09996c262699f868f9ce0f3bef627aeeb8c1530cb912292e61
font_02_sfnt_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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