Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bbef557db9fad0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 18:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6bf642a377802767be71157d705e10e SHA-1: fe8c1bcdb8ca5f6846e0f5cb354329c9f147a722 SHA-256: 92bbef557db9fad0d72b6394588415e6a2a25e1295e6ecd4ab37fe4d2fff88da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links suggests an intent to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4026685696130fdd7056cf7d5ffb96f7/18415579750.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086664ae52ad---jinovedadorojuwarumezu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/jfer7rnacll17bnk4lldfk5jl9/dezasolepilogu.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/kotiradapezog.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab4b63645de6699b5b51ca7486279f8a/nugufunasadam.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/vatuwebigivesumatogiv.pdfIn PDF document text
    • http://taigesw.com/upload/files/nidutorojaseparukiwefo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d714157fc---wefojiroteselivanokawesis.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160773b4888c17---gujiwusitifiwidanif.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/2204671593.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/duxajudiwepi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/519e1ff98670f41601abdf0e290edc26/74385269021.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/62792578715.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/68508137933.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/80257446939.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zapojokewukojinosuzabe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724894eca5---67136511004.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac69065d0---31725792807.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/xulukepiko.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/85a8bi4ug3qui9tpfuvb7tm7b7/3654347040.pdfIn PDF document text
    • http://rc-modeller.se/images/file///58768770720.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3226164263fb6e377b98ecffbdaad8a6/xelujunesirijisom.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/91785461269.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/gixixuvodagisagojopovuwa.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/89949542294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+con+verbos+modales+en+ingles+pdfPDF 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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 20160 bytes
SHA-256: 82ebc38974d47ec4a382671c2de04ad7c062e274b4a2e9dd32e29ef9cab46740
font_01_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 11184 bytes
SHA-256: 8dbc04691f050588f216597a52110712387d8280654b699bf96a74a7df942265
font_02_sfnt_off000135d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1