Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc14ace0eafcf7f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 00:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7bb437b17b5047b5e41edca49c11d5b SHA-1: 042071d5844f94f9e6bc3cc3192dc96f0b2eb792 SHA-256: 6fc14ace0eafcf7fc30b7c3a828b7e3f7f320eeb66dd4638eba0d811093872e0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of these links and the overall structure align with a spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/i2cgbor5gq0m9nt4robs46n7bm/64261486087.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/botpd7foueo2fu760gu2l7fse7/zumizawotuxevofitaduwag.pdfIn PDF document text
    • http://hydrem.ru/images/file/folefopijagireromafufe.pdfIn PDF document text
    • https://media-get.com/userfiles/files/70195913327.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/71e31e853f26925976ff9e9cfaa01c6e/3993571853.pdfIn PDF document text
    • https://clinicscrm.com/img/files/sufegopuwusejoxutav.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/voxigavidalekeso.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/91719577288.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2d89bf25f28adc0ddb89355febd66b50/livizajinoromitujola.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/26175469658.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vadujataguwagas.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/rokaveborok.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/71912879210.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/95835877306.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/ximowujidaxurivudabamez.pdfIn PDF document text
    • http://gugugroup.com/userfiles/konudifuduwewixovasu.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/peduxixijibiduxozuneg.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/43833532548.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/1679343532.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39629cde8---87796195583.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/45983389219.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/tazoratamubaruzex.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/pavizawokirodivaxowulumix.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/vodebabepujusewogiler.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/42675640140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aptoide+hack+mod+apk+downloadPDF 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10668 bytes
SHA-256: 4b15d2d75c875d45891b043410507ab200de4757864b56304e2e3d0be6db8c8c
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 17748 bytes
SHA-256: 804dec8b0e4111bf0f75ddb3414c3439a16232e225b2c61af150df5c9f99f59d
font_02_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1