Malicious PDF — malware analysis report

Static analysis result for SHA-256 487b88e0b59f86e6…

MALICIOUS

PDF

94.1 KB Created: 2021-07-02 17:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1565b2ab00d6003dccb6412e9c0cc364 SHA-1: ba704d5828d63e276bae0d69c23c9b1e82536116 SHA-256: 487b88e0b59f86e6c046eb4a05685c6000fefdc7e357d17f20bc67615d253f1d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6f2e4cdfbfaf81fb71f563de9b66b587/jujawivosavidawutasus.pdf
    • https://ludifrance.fr/userfiles/file/96439958863.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0f4bb35bc20b4d5428ba9a26e3986b67/52317884566.pdf
    • https://anandamsanyal.com/userfiles/file/tafifufemezim.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tnabco9uure2c6a2fc65962luo/latabudij.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073be75928e0---vubotuzonuvidivi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e9bd881d17ab6cd5c1d3aca40aa2beaa/bexaso.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d1288f34e9d5624a1d2aa25650720f60/87394573862.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kkjvutodppg2441tq9gl9musg0/77752808798.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/be932c84d728cabad9b3fcb3c6c7d27f/vevibinapi.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/96374942295.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/89141c6e961e6b79e7c59de8b15182e0/47106374793.pdf
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/20321924369.pdf
    • https://rowadalbyt.com/userfiles/files/69742972135.pdf
    • http://houstontca.org/Content/uploads/files/76935610903.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16216484114919.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ve6lb5ppc5t3aod94crn0u8a71/47273527647.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8c402626---dikexenugax.pdf
    • http://go-pxl.com/uploads/files/54701120289.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea3203270---44439227861.pdf
    • http://mindentudor.hu/userfiles/file/53810838275.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sequt2g6ao5b8p2d5f77cc1o61/sojubijaxomujovezi.pdf
    • http://agendatourvietnam.com/hinhanh/file/61229668139.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0fe7223b4d6a1a896b934a29f8e4cc0b/96329421154.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/kjbommkksatuh9b4iek7s4ells/9858068100.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436303da5b---rezedijiki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+hoobub+and+the+grinch
    • 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_off00010d84.bin
0bc9501479bd4df3a2775b5d542cafac6385a55a7ba8d22f76277a5dc19fffcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 10640 bytes
font_01_sfnt_off0001258f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 16792 bytes
font_02_sfnt_off00013da1.bin
8f4fa8526218cffe3bfa83394c658ff618a6390a5c71bfdf6fb2c3c3932fd1b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 16940 bytes