Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ec65d929a61ef8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 03:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f70231141728c846ed4bd1cafd6de41 SHA-1: 579ee50d88ce7d8ce1c17f6a07042d421272497e SHA-256: e6ec65d929a61ef8ab32382cd9b7300bad174d7ceb201f61bccd3b7007678387
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of these link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e76362cffefc2253cfda687145897881/meluwulekozawak.pdf In PDF document text
    • http://tsrmmessina.it/userfiles/files/xuwigapoxixebijakitifa.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/52036632359.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/lazikibumobiso.pdfIn PDF document text
    • https://pellevah.com/upload/files/18200282992.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd0a95c7d---sobawerebotisosabefudisop.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090902081470554.pdfIn PDF document text
    • https://nexapos.com/upload/files/gugavatujufugidujisitov.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/29908985881.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/virifogat.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/oq9lkn25u62ulopslma5mprper/muwijepalam.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4db9c102---33966759066.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/88736047842.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910054720.pdfIn PDF document text
    • http://asid.rw/userfiles/file/59316580725.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/63453005837.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/veviwexewomexamumudu.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/95473633394.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/ravesovozazapasororogan.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lidezekalapubefixu.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/nipodazafudomodagexonosa.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/tuxoneropud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=metal+gear+solid+gameboy+color+romPDF 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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10856 bytes
SHA-256: f3b2f7943d2d2216ead82706691793a8f4ecd84a78972695f01c81d37d1ca93e
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 19992 bytes
SHA-256: 9acf9a740d04b35bbfae3314d1a51a609f80f7339b0b7085d1f7a10296925e21