Malicious PDF — malware analysis report

Static analysis result for SHA-256 d110d520c8d36635…

MALICIOUS

PDF

75.1 KB Created: 2021-09-11 06:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55988b8ea3a279f05d7ee5639dadc1aa SHA-1: 2bf598257289afb04c7aacf91ab88ae300d2aecb SHA-256: d110d520c8d36635a040a84d5ed72b8df1019796a478c4a7e91cfbfe6cf4449e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The presence of a URL with 'download apk minecraft' suggests a lure to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=download+apk+minecraft+1.16 PDF link annotation
    • http://tfforming.ru/d/files/kiladuwonutesat.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/dajix.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/81464291036.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/55074653564.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vapaloruguwaporebu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/96732254486.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/jutotat.pdfIn PDF document text
    • http://hkacca.com/userfiles/40442560389.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/9481231802.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/612ee2d275e76.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3fcff14378a68f9bf4316ffe67084fb2/39141501560.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kepekotipaxubor.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/70282237706.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/ledoforikime.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/n9sf9vmq7mn1s0u9eqb6oj7fsc/rusubunatave.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/buvebot.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613584f1c4f4f---85821860650.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/25906773443.pdfIn PDF document text
    • http://kdekdyjak.cz/data/senefanakolepon.pdfIn PDF document text
    • https://luminex.pl/upload/file/zazatalopatuvugivobijesa.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/27843126581.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/54301513145.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/bokilujipilaf.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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 11076 bytes
SHA-256: 9252a96e47ae629b68960c19a8e9a6adb7cfc582bebbddb4f320dfe72298d779
font_02_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 18024 bytes
SHA-256: bda9e6d04510e1f13dc6c37a8d9e292da9c3f86cbfeb7caee6069031046400ce