Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a4461bbcf51c8c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-23 03:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18d0da826ab3712a8d91d53d5ee23a9a SHA-1: 3f6a9a388135aef9675c3742fbc316fb8262b67a SHA-256: c6a4461bbcf51c8cbd8146dc1779110f28fd669ed374a1a746909a1bb41498bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to files hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef440ac42---delotib.pdf In PDF document text
    • http://rilta.net/userfiles/files/26182798584.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/vobabazexigewozafewoxok.pdfIn PDF document text
    • https://themalc.org/files/file/46859690058.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/revewi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de205a7eab2---54762870300.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/povilutewisowumunodevu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bitowatotevizadelara.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f7e0e20577d46fed6c7e61b064fb7248/18046048053.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9edc369c---67401801479.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1be300e16---10723848478.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/waseda.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750abe87395---bekikunukevowifex.pdfIn PDF document text
    • https://lecapsuledigian.it/file/reparatusekovetozanunuwen.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c84d35bbf5aa0ba16c253009385d3a08/1173067927.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4e13f377---38287566445.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/99578862955.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a9ec0f1fb5c407c44bd2f4935cf0024d/tenepomob.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/16927061050.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/15162655839.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8661ceff5b26de7d9a58c81c1ee76dd4/dagidolegajozetug.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/928er8uknqcl075su4rplulca4/tiniw.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/36213150750.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/9708577302.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/rutomoviwilenadanexizofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+return+of+the+little+prince+pdfPDF link annotation
    • 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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 17356 bytes
SHA-256: 1bb235d34c621961d16b9117bb62c736387b321569596cdf2e63349f0d6f504a
font_01_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 10452 bytes
SHA-256: 72668ab0ce642e105fff906b278d590329214e91e5b216cb603cf359ba813af2
font_02_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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