Malicious PDF — malware analysis report

Static analysis result for SHA-256 c669b74a9b6f6c9b…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 13:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 87d37ad3fb8e76cba487f90ee2cfe669 SHA-1: 150c3c26246c2fe520c8a9fa410fa465a8626de3 SHA-256: c669b74a9b6f6c9b7e687c137d5e6c004489c435bbb74b535e90d235194440b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content. The presence of external URI links and the overall structure suggest an attempt to lure users to external sites, potentially for credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8100

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://coretry.ru/uplcv?utm_term=autocad+isometric+drawing+for+mechanical PDF link annotation
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/677b0f843fe542c06a110e3c89a4381d/ginelel.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf112885f1---68970820572.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/nanuxadilakumi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87d0fbdf8c---61066055292.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/46c8a1b3f6d0e2ad90be76c272d09227/kaxedijetirelopa.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802d844fac---92178534273.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/wijujeser.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p4iuuq4li64gjv0nq88kv61fd/46048572766.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d0924e6774ad6fd57966993de0beac8e/milodo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ds2su1m5e01hl08p0erce8du5n/loxufugawib.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/7326321206.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/608f1b7ac2ef3aa641de9b5444c3e750/30967323014.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c3ca3f4e---45346501284.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb167d998fb---zaneteme.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9acf3552b---67522374844.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f1412676---lilitaretuz.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e26e61f342be73a0ef10a30f9f63ad56/wanadanizelovet.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/ribil.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/jonibutexujevobasib.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/50759677483.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bovisagatikinogos.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb840b9ad---xobizesikuzitamugasakoke.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/poss0gfolthugm3jlot4sb9v77/jomuxaboxofimevipavuneke.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wikikodomekuwegavimafi.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/28954891314.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/tuditoduteterusetusilapag.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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 17132 bytes
SHA-256: c7571c4b6c386f0000b71df4e082aea9c3d198b14622ee59b461eada4180c067
font_01_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 11092 bytes
SHA-256: 18929d54bee188b722bf0ab5dc8687c214889de7e93f56708abc4eb587c374ea
font_02_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467