Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c5c71e00e35d6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c33785ab8cd68bbd423421fafa208e8 SHA-1: 580d694f1eeba82ac53fe36bf4c92da15a963228 SHA-256: ef7c5c71e00e35d63a7c6dad6cde75db880e7527bba0235768244dc35ba22a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate a strong intent to use the document as a lure for potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=install+kodi+18+on+firestick PDF link annotation
    • https://ripedzn.com/app/webroot/files/fckeditor/file/suzeg.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/varonajuregasijuzizes.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/98022145751.pdfIn PDF document text
    • https://makenie.com/upload/files/19195980943.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/tamujewutab.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d0a9e181---sisobetebuzaxa.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/fajimodexuzodebonib.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/ravujakedogetudizon.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a2b3cdf0d1b096c3537800b60a6d2b70/kofibomuluvemuze.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/pitewugupakivawan.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/mumefujuxefewojo.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/misigutefiwo.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/44288704736.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0bb53690---14039219908.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/39604999846.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/78999173486.pdfIn PDF document text
    • http://zerosquareonline.com/file/davoxosonopux.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/12859099929.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bikugonawuzor.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464de041584---vutila.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/mafitokobisaved.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210917115419.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/33337621520.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/53188072356.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e9f3d3e7---64856981090.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/gubez.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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 18052 bytes
SHA-256: ca8dc29b72c393a5a627d62652c932209d028be2391c471c848044fcc55e7282
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10772 bytes
SHA-256: e3b12d37519866783d7bf1140841d7488757d9a7b8b46a0606ad9d48cf9d96d2
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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