Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86b209507c4119b…

MALICIOUS

PDF

87.7 KB Created: 2021-08-04 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce7bc240f7a663622a0593a906ccbc48 SHA-1: 13c7fb88fcf21048595a6ec18c7b14c2efa401ce SHA-256: a86b209507c4119b9f43cdbc13f6a9eef6c2e763dfe77c946b00a1ecd8320868
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=metformin+500+mg+weight+loss+pcos PDF link annotation
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/55cae62df478f617b38fb35dc6664eed/tadokinowopiw.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/58004359395.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7a517d38ad8bc1c657a521978138f536/mezutenameworitapojoras.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/zuzuri.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/91510140533.pdfIn PDF document text
    • https://asi-filter.pl/files/file/51775288220.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2ugc1cnnob4dcrat47c0hrk6e7/32835368433.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/totimumaberurevuviwuxe.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608689eaba9ec---dipigonolutedobeta.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/gajupebefi.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/javena.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a226d5cce3f---birakoxibebeve.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01d18a1d7---feboberopifo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/44446557548.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/8142608769.pdfIn PDF document text
    • https://akemi.ro/hirek/file/53003738577.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b0b2420d6fdea6c80002c386407841f1/lufuragevoxozovadu.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/tewugel.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zizotivaxakofikel.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210715_F7D6EADF8F2420AE.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5b3d5956---kexijesaberux.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dcb2f26ff9f4a3a43692a8fb16c56e0b/kitewovamorunevi.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/bibawuvitikopiritila.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bc574808b7d57b31854c3cf08d946f7d/46543368534.pdfIn PDF document text
    • 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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11100 bytes
SHA-256: a34b34044f04b8093de04ee2aef2ebdfc7d69477803f37819880793ec053c6ae
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 17216 bytes
SHA-256: cc3280c5d7bbab4b2ef3ce041736b53619e53f2f57258dbec76dbbf535a1c787

Open this report in the interactive analyzer, or submit your own file for analysis.