Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38c4d2f8b30df55…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 10:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a84de5bcc1e6202cecc144d014e3d6c SHA-1: 9dee6fee3aac006592e65c63986b6ddd0053e005 SHA-256: e38c4d2f8b30df5523b6191ceff52f25b93a42fac125a5fa1947c0bb8a05bf8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing malware or directing users to malicious sites. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a malicious distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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
  • 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 https://philabc.ru/uplcv?utm_term=best+android+app+not+in+play+store PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4geso4tkfnjk89bd9iu258r0up/24789619181.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/kedizovoniwowujijiboxite.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/540c1ba891dad439446e2fa8ae3a2bc6/46374421705.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/61799476818.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/nojamekonisewidaj.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/niwukeregowenezobax.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/97155750351.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/233f7e31ef0c0cd49e8f3e2604d14405/21672746223.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902010901645153.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf54c5dd0e---69225680562.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/34197946039.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/19888034649.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138d17a03ba5---14909976372.pdfIn PDF document text
    • http://sushi-belovo.ru/files/8870119790.pdfIn PDF document text
    • http://www.bash.cl/media/file/suvidivexoluxivudewuwom.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5ec74879953973a8c68f672d294f45f6/57494729824.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/ledibibokimif.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/88154511525.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/86777149941.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zisubutixikisegukijupajon.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kotizenegolevelefagefet.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/410210_zalusupijoxaremonorami.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161418c65d5f47---23694010687.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/mevir.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/ginavuzumaguminofujok.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jinubodifoburozaj.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/89640102683.pdfIn PDF document text
    • 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_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 19352 bytes
SHA-256: 22298d166a610ff5ccdd192c9e051be209f9466acb9f48e9d2a2b497f794f5ee
font_01_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 10552 bytes
SHA-256: d891dab47f7dd88b9043fc16feb4160776c63db64a2d7231a0161d31c4406f26

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