Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71ba2c4ed365bcc…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 22:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 541d462f65ffe7fc3804b9dd40fa81da SHA-1: fa2ea03094548daa3d8e8bbba4228a4c30ae5955 SHA-256: e71ba2c4ed365bccc934af60285a674bfec1e73e41207501b3b7ff83e56671a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9ed01986---tosipajo.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/268acd2616bed7b828f97e0669aa443d/jigufiwo.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/xoxifegi.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/87e5c98acef18462870da252dcb4a112/90603036244.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0qv3mfrb08r9l8psv869cfe7ro/jimiwutetajisawulozedenov.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8858d370370aa6a903aa5d1e617bed48/zamuwodaxure.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc74317462---gafivusurawoguwuruvawiso.pdf
    • https://ost-fogging.com/upload/files/43620789701.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c398137d1a9---wafowokovilipurisop.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5d0a2f23---42120641211.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a05229ee7652f57542990e732255802a/zixadele.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65b05063a407fb563a880a76ddc72f68/33930631909.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084717167df0---gevujoxumopabowaz.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16085622a7684f---20295376625.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d9459d75---37511809589.pdf
    • http://giga.sk/storage/file/81399902474.pdf
    • http://mtsskzy.com/userfiles/file/sugegezixu.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0f29d68c---75201122419.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/nvn9ja336e4d5hroi4al0vmg72/pigawusopujenivan.pdf
    • http://adabaskimerkezi.com/upload/file/ragifid.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071a81c84656---41491189333.pdf
    • http://bostonmentors.com/userfiles/file/1138361458.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=erase+pages+from+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_off0000eac6.bin
9bfa895bc9ec3caa4e257ad44fe7f1712e31ce5a8e2ab11932e9e961cf804cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16960 bytes
font_01_sfnt_off000116a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 16792 bytes
font_02_sfnt_off00012ebc.bin
e7c69d358c31b5716ce47c04c7ca30b405420f791c0c2e91486a1e95cb2ad14c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 10484 bytes