Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9dbbe1b238808e…

MALICIOUS

PDF

63.6 KB Created: 2021-09-05 10:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3de01b5de54695386c74fd74d943cad SHA-1: 44beb62d07aff99db3988f874a9293d9026dd1c0 SHA-256: de9dbbe1b238808ec06de823d8effe16e3cf3e9f0f4c0b7a8d94674ae9bfce52
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and a high number of links per host indicates a deliberate effort to distribute traffic to potentially malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

Heuristics 5

  • 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
  • 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://gokea.org/upload/editor/files/7115283495.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd03761f9---49344212402.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68hfjc8upn21omdl0i0n9vq5sa/funumenuvajetunutig.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/winozemewanif.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee73c154f---50300076776.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/84564534421.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210618_050134_8889.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4ad33b6d---xavijoropexatewesog.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/40249325892.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e9c7ef5f---52054585004.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/1160002834.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/dilojelipotikipumixopiwol.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfad4ffa7---nedejorezavojubuki.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c4f7080730a8fc1a2bdc2ee8843dd564/74625630554.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/piwufikeduvesu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/003e53eed4d4f98c3064b112bf126f09/56626892543.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/labatopifozuw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce10471825---lasiduvizurigawulupidijox.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t1rmgg7s1jvb5nqf7k7iaoi6d2/fupanorak.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1aod2s1dcabdg6m8s7uk4nguq0/78340983375.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/4320474503.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/64737666313.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/629e59fefda7f61c1652d86d3b07cc59/46818626069.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b8p59f8eulmmc56771p0vdg8r6/64150644898.pdfIn PDF document text
    • http://metallpress.ru/files/16583327241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=butterfly+metamorphosis+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1