Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5af5bd4d15665e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 02:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7afef6a4276bbb703bc3b445d7f17644 SHA-1: c99e5f234660a591c8d8b42ba9677a2819acb2bf SHA-256: 3e5af5bd4d15665e4b2b1eef3da10e76cf7de2ca4581e0d8a7e4871f6c9831ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://americansemitruckparts.com/d/files/rodijawenezipejov.pdf In PDF document text
    • http://resumesfromabove.com/userfiles/file/7871701445.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/99119264669.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/58073327381.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kinufotifatupipu.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/zivav.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/62344738657.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///nonirotetowo.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/49357104816.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/gunone.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/12525583954.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/68787791999.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/68962031999.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vufaburikibusukisara.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/ketamakif.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/61086816495.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/85690267898.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gepod.pdfIn PDF document text
    • http://philboyd.com/redawogavunewagupikugisa.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/jajugereduv.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161307409cc3dc---dofubuvaxedi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/30de731938107a7646abd5cee16194aa/mojitugeligazevixawef.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec29cb574---sedurowujoninuzuwomelaf.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wewiwun.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/72591687402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rainbow+unicorn+attack+evolutionPDF 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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10584 bytes
SHA-256: 008f78101adc519e5b3cab22a8cec2a099951560183312dc2b62ee11a2952100
font_02_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 17676 bytes
SHA-256: 3864288c47f6deb6ab693e1dd04981b999615e933e851cf66355ed674ba5c1e5

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