Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fdcbf3caff90c0…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 20:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08025697e38c66bf27f66101a82dd74c SHA-1: 07f7c2cfe67fc9d0db80c104635671c3f53a8171 SHA-256: 31fdcbf3caff90c0e4bce559ee0578e87e0f335302d2b211e2e11f85c6c19172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and link farms on potentially compromised hosting indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://suksesunited.com/contents//files/rubifagefidotujujepilol.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/t9gipo8d3rkdom32aau0hnt9th/ragogenajevabupipev.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2b801d0f6b71961003c35f3ddfb88567/wadikokijitagoloxetazus.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fe26411be---lolokapubuzolukupo.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b871b66d50f---fijixoxekupobalurixenula.pdf
    • https://majubesar.info/contents//files/jakuwiwizuduz.pdf
    • http://botosani.ro/img/uploads/file/jowita.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/94026687176.pdf
    • https://akemi.ro/hirek/file/zalerusirezekunufo.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426b9676ef---41369969935.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d213c37d347eef87606993e284880de5/5864843747.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8bc62adf8---79829067727.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a16f8b059---79918633189.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/cdec92adad2e012105d48fd66a57ee3c/vujevo.pdf
    • http://zrdb-drogbud.pl/Upload/file/98605868620.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a69fe1fb3---mamuvajijisuzof.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/6699944c0257baa4af28ed9d1213f1ec/gaparubotukitirid.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160be47d9c719c---fidijomiliwobiviji.pdf
    • http://trendybiz.in/usersfiles/file/9269417872.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/67dce3f0676023333a4a7f8a6fb07331/11800162304.pdf
    • http://fabtur.ru/upload/files/75547663788.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/rimisurusilixalowulikoduw.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2be0c317d---faragikukivafogeza.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9936701e5663344868d6efd96a7c3042/fagaseke.pdf
    • http://sicilyontable.it/userfiles/files/28645656779.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=which+is+the+best+rice+to+eat+daily
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc92b62d31---fomubodupofewopixabux.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_off0000e71a.bin
19cec8428ad78f67d77e5a46b93b815eb08d09884f3466bfe8a3a9b51697f933
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 10612 bytes
font_01_sfnt_off0000ff83.bin
dbc4d969b32d1a6c24d6140916e417a9e05e9aa8042a93f78363e568c12b2f36
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 16848 bytes
font_02_sfnt_off00012b91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 16792 bytes