Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26d8a93fd748ec2…

MALICIOUS

PDF

76.4 KB Created: 2021-10-02 12:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac5c3df8787cf9b534e065b79a9b6fa9 SHA-1: 0eae93dae630a1536205333ac2ff645480cada19 SHA-256: c26d8a93fd748ec232fd7b24dba9b8614ee6cccf639ab479c5015e5bf6bdb865
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further stages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://medicentrumnz.eu/medicentrum/files/file/60507094596.pdf In PDF document text
    • http://velisend.ru/photos/file/vadalaga.pdfIn PDF document text
    • https://nasikampung.info/contents/files/65283657772.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/35140278202.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/63583997743.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156a1bb3c47e---62876292573.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9j32fnuhnnuph1uha8n44jc0e1/lijegebilenafexumotuluku.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/xumoreluk.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/79407311321.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sooe8lur6pihi42adl6b9rk5ts/78178556448.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/51353474609.pdfIn PDF document text
    • https://isgz.me/userfiles/file/lidefekajeselezexikelisik.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/79569026979.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/roxibenufiwiliwadorosa.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/71006829439.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kefegitaduxezusijeke.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/wigolegozikidezupex.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/37033688345.pdfIn PDF document text
    • https://onlinendttraining.net/files/82173613751.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/sodox.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/38304389565.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157f87394bdc---35929785515.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/gulajiwe.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161451cf7892cb---tazoguximuvejepas.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/tixefupoxuxoloxobaxuju.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/vojorexaloxisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=letcher+county+ky+mapPDF 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_off0000bef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 10596 bytes
SHA-256: 702ff698de0774083459c2ce0254a2415b7160f9671b5f783248f7953cac161d
font_01_sfnt_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 19708 bytes
SHA-256: 99fdb3eb7819b2d59cbaffe2970deba69e5dca0653446276652291f8c70e2c30

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