Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5898583e3cfd639…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 19:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a2a07c75cc444cefcca5cfc0d125e22 SHA-1: d3e4fac939fdc669fdaf120f67018e9798ccee83 SHA-256: e5898583e3cfd639e21322b2343e83736240639afeed7a4eb31cfa66f5442990
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://folientastaturen.pl/_data/file/xikavazuvulij.pdf
    • http://kruengrangthai.com/files/files/nogusifaxilulapikelagadik.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94358156d---32644899955.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160820bafa2cff---rerevusupu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cfcf70b7a01a8c0a67997e96e16654b4/65523583155.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/12729838712.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1k0u2q7bk2nn4s4mt3b5j3ejt4/gojuromuguxujisoso.pdf
    • http://volkshilfe-vlbg.at/images/content/files/wetimamuxujukezuvumok.pdf
    • https://vinocastillo.hu/editor_up/tamodulep.pdf
    • http://xn--eyt274i.com/upload/files/lexug.pdf
    • http://metafelix.it/userfiles/files/60589027727.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/bigagudenezodumizavaxe.pdf
    • https://smilepaper.tw/archive/upload/files/wonewanexikonikap.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613a490969---vimoteviwezasanisedebux.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa17d5654---tiwejonitabute.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/58956386008.pdf
    • http://jhroseclassof77.com/clients/45984/File/zesepenerojawi.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d14bdee398a3f355d4974208c0e6f7a6/xanuzugilib.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac080e5bd---76190505854.pdf
    • http://tianfonmm.com/d/files/39912880929.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273ffa9e2ed---xujexudeboxupawogejoda.pdf
    • http://www.focitabor.hu/userfiles/file/senabagavuzej.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1e85d3508d67468030bf548e3805c0f/bupoxakezosejorasas.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c256fb85b32---duwipen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+word+mac+free+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 16792 bytes
font_01_sfnt_off0000de45.bin
4e924ae25640960c41a48bd0950a980ed7caed78d072c14e219b771c45251b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 10556 bytes
font_02_sfnt_off0000f65a.bin
7b97e660878730588d6b3d643c273f2b86fc195c1f28a0017f384b1e35538f75
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16460 bytes