Malicious PDF — malware analysis report

Static analysis result for SHA-256 68762ffca90200c7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 04:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3463339acc396d6e62eb34dc1754a098 SHA-1: 5184807e182c74f963b6ddc2f03849033848086b SHA-256: 68762ffca90200c75cf382bb43221b44d73b5fc0d5aeec6ff63ae6354e7ea999
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4505

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://biorenta.lt/ckfinder/userfiles/files/32676169698.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d84ef318---bovonokipumu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/41bf0d0740df5dfd086d0107b25814b0/veferijegenofujox.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/wusexokixepitufezujaj.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d034370e4f6ef4f72d8102916ac0438/5912298414.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///94067202634.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kesanewovitigovufazeju.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/jiguvud.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s607leluj9daojudcb76ms5bhh/wogetoso.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c025362622a---34816834674.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/wavaxatopekumofo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xitatewarotagiwumagejovat.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083005db0c66---sebozobitarozeramejizoder.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86e968f3aa---vivimoloxiluno.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/pesewoposodik.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/03815614c6d9c5c2677a93d33f9db648/49677407251.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/jurawumowivek.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073546e2d04e---derazureruno.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070845988051---juxunijefusalugugupijager.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070936773201---53522232798.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cc656004---21745692114.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1284c404e---dusogizigavenorexakejeb.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/75816347556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+magic+faraway+tree+pdf+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c2e981fe9a8c8b7d6f8fb1435a3e4bc6/migununonisorama.pdfIn 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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 11064 bytes
SHA-256: 301e9548e2ee399adaabd096ea49c51e94bc0ad968343baedffe8dcd8da764cc
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 18728 bytes
SHA-256: e6e4288ae6571efd9db27a6c272ad9d9a3ce97753e78b195759b62307560315c
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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