Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ab09eed478e83…

MALICIOUS

PDF

72.1 KB Created: 2021-07-09 23:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6a74bfad00e94ba3c3abcca2afe6e81a SHA-1: 0a4826706aea30aeca137b1ecc74f398c8daafca SHA-256: 5d8ab09eed478e836a1ee7ca8916ccf1c8b6b2d8fcc2c20dc9f8cddb12a82dfd
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It contains numerous links to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The heuristic firings indicate a link farm strategy, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://infrive.ru/uplcv?utm_term=scooby+doo+and+the+loch+ness+monster+full+movie PDF link annotation
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0be6e822109c828450753e2a81334edc/83886081219.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2f7db2ebabd7719a96f073f8834c9be1/gufalin.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775d50d325d---58883921957.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tjk575oqdpm9s909qs78tf054j/37240345379.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b3fd19d578037a026ec71b62b8530244/wuzakote.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160746fde5573a---ladiwejakonoraxirawo.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/sisobogedejizufedisi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e4ed740a---gowizupuridiretamukanowat.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/19400efbad4971471f410d6e8d579e55/55081099416.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16221212695005.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080c80532e0c---kusedagezuxejesimimuxez.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/150c7882e8ec4802ebbeac980d94a06e/85386832260.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tepakuduzebe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecca8d7d26---lepezoxizojukizev.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b605df58048---81836442347.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/79fb40d948532b0798fbce0c04a948d2/zivedogeja.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/73c67903b07a772257c14543fd71c324/80584006410.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/66505730181.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wemegufevive.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/nn9bcfv4grs09c6hocecbolum5/98250167160.pdfIn PDF document text
    • http://mesterek.net/tmp/betotapifawosotugofo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ccb1b50d42823b9ddeec58d52c23dff2/kulanumaneruriga.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lipusozulewug.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/19260132714.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/77025232823.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/48682985626.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 11236 bytes
SHA-256: 2fd2fbc042b3c63718c4e55fc1d7234889b7b8d80a7e2c0a86df060cb968b91a
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 17304 bytes
SHA-256: 07466160a413ef26839f618f32f1ca43f127585d0ca03964d0b9bec46195885e