Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4416c50eaa9206…

MALICIOUS

PDF

74.2 KB Created: 2021-07-13 18:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: beff90ca7d10b5c350aad00ec0a4e564 SHA-1: 7ea5382bdf5d4614b79ed109a86ecfb2d3acb552 SHA-256: cf4416c50eaa9206b46c16eebf0233ab7bea1e5b369082d331f3d720d3782582
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb520d39e---19260924286.pdf In PDF document text
    • http://attlas.center/userfiles/file/folof.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b48551c65e1---41622465792.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/49893311829.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/20520899806.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/75300012621.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeae550454---wonavo.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/fovaxamakeberaj.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/baboro.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/62327747080.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079d74617382---33893179115.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/55371158272.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7d74cd1b6f883572a1ba58ffbfdcbc11/fedotobivoxamib.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/36666897433.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da677adde---90726199222.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078436ccc70e---duxilatawuwikakuxaxom.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071304515918.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/seximomaz.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ceca8e6a0f3c4c4b7b0fa7095cf45fec/nuligulixula.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/70a0eade9b34d8ec7fe44f161909221c/56569512896.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/tuwitenufepefasuw.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca7c2eaf9---wofuxoti.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/17592749426.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160913f3807e8b---63258253421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=1994+ap+english+literature+multiple+choice+answersPDF 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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 16188 bytes
SHA-256: d75c7dc1b73c40a2e9b8ed2f197f767be1b05849835e3b09a7df0c37a9647f17
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 11208 bytes
SHA-256: 3e39d304629dd2e2377d185831c774d94855fe3d26753ed59c52ae1691959ba2

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