Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63b467f586eed06…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 17:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 56d6815097d5642ad078ad4329712de8 SHA-1: 66344706632ed5541e73d5f92b837e34e8f6af64 SHA-256: c63b467f586eed060efec845f616325c4097ff3fe6e77274cfcb66b60e04287e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://strings97.hu/userfiles/file/82385957394.pdf In PDF document text
    • https://laznia-radom.pl/userfiles/file/fojejo.pdfIn PDF document text
    • https://digireg.org/upload/88192736082.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/15155bc4a474fe3296f29cfedccf087d/54877776671.pdfIn PDF document text
    • https://strechybenesov.cz/content/9089866937.pdfIn PDF document text
    • http://mqskin.com/luutru/files/nigoxa.pdfIn PDF document text
    • http://rotang.net/userfiles/file/jolanili.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/zeguzeduwosumejod.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/rofexejaromejorisoku.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/madilolar.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tasinapixavew.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/rcmtj4emjtb15p9od8ungl7fe3/kufosomiwadupomisaz.pdfIn PDF document text
    • http://ned.ru/uploads/files/5936775527.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/84260619585.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sujonoperutirunidem.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/92081809130.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/42986593467.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/69677416038.pdfIn PDF document text
    • http://artio.pl/files/files/zuzabarubetedokuwumoke.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/13429552823.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/23149590682.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/71805440667.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/81774317383.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444b01b00e2---xagotibomure.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/widewolikusajaviwemivuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=samsung+m+series+wallpaperPDF 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_off0000b2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 15172 bytes
SHA-256: 941d2280c78a402bd1f728687368323108fe9b3f54a7365dbc0eb8f007d00b0b
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10636 bytes
SHA-256: 4c125c829d30a51927af9d8feb0d0070ebd917a399d8273521b4a95501148037

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