Malicious PDF — malware analysis report

Static analysis result for SHA-256 031c2b0e8d5ecc00…

MALICIOUS

PDF

79.6 KB Created: 2021-08-18 17:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a42cab3f14f72bfc02431cc2163a7e3c SHA-1: 937351d9052f944369ec8838fc5ebf2466039e3d SHA-256: 031c2b0e8d5ecc00e99e134ee702eac82c9caf510c4aa79b277974fc8aa88321
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it's designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ee4sjk6e9h7atbhs1hhmh8as13/memobosudutitibizapirag.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/968jnq7gjcn8598m801r474ld0/tetax.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/18066301720.pdf
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/bijanolariwelobonasixu.pdf
    • http://archissimo.eu/userfiles/files/58028093000.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/rixejajobofo.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd64384174---63528593128.pdf
    • http://dui-antidote.com/images/userfiles/file/67284436489.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/7876621462.pdf
    • http://kibbkw.com/uploads/file/58956957630.pdf
    • http://dryoucosmeceutical.com/userfiles/files/81009015599.pdf
    • https://jotekonybakterium.hu/userfiles/files/fogarenuj.pdf
    • https://mangmalungtea.com/userfiles/file/61749077238.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/38554637576.pdf
    • http://nenkin-t.com/upload_img/ck/files/tevisovafuvelosez.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/50686649896.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b07307451---zovunozisuxojinipodogu.pdf
    • http://kiavysocina.cz/UserFiles/File/zevopi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bbebb166b---69458799447.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19205321587.pdf
    • http://minhquoc.vn/ckfinder/userfiles/files/mubewologijaw.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/39246c723a809d20733a1d1ff1287068/sogudoloxep.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1ef595eecc15c86592c8b8e57ef11a82/bojezibeberevasukeduwuda.pdf
    • http://debsecond.net/UserFiles/File/fapusulapakemokipo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bitacora+electronica+de+obra+publica+cfe
    • 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_off0000d608.bin
d555f6b8ba7ee2b04b572b1bdc3a0ef6b09b462d65bc0e1bfe19d8ee101b361a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 16684 bytes
font_01_sfnt_off00010044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16792 bytes
font_02_sfnt_off0001185b.bin
f97c6d0162ad4ac51d4a2eb2f31a5793b69a1da4c9a48a3491753a643b984571
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 10736 bytes