Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6eac1d65deb0ca…

MALICIOUS

PDF

94.4 KB Created: 2021-08-21 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37ce07cef4b1d04909e1fac04ce4cdb9 SHA-1: 430100168a46f08b092be0a6939bb41e8845b143 SHA-256: 9b6eac1d65deb0cae17561d2a16ea031b02cf40a1cc11630f7e387aa16badae8
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malware. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb1594cae---zipoluxapoxina.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bd343821---vukexirivupigorimumike.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/4082264047.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8571c5bd6e---42996599179.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/eb24b762f7d6cf9071bd7e527f5793f2/mudelaputiwopur.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/93400258103.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/489lilu32tjkn4kjsi3i3rsto1/nibozuxekaja.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b939ee43662---putezurupagosixakijetufi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bec671e3---dedixematuzuzevokew.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81853db9bf---50128515921.pdfIn PDF document text
    • https://xigmatek.com/upload/files/23036219516.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/jexojikotilarijawovagenu.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/54533475304.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090335658c1e---86176838582.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/werajijidinukijes.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced691a3729---56638797709.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/miligibotadalalopizomozu.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/raxofudexamulateduxubogok.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dbc55514---wezonuro.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/l5ulkuvhsbp6v79ms08v0m5f90/476451723.pdfIn PDF document text
    • https://fishboat.hr/files/93231528564.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf0f30ab1462803c9181027cf6c55116/70329788756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+pubg+names+generatorPDF 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_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10748 bytes
SHA-256: 2ac33475a5bb970a91278f1e87228f5651a393679a7a5fe478e67e4bc77da2de
font_01_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 17580 bytes
SHA-256: 7b4bfb588bd4dcf89786455285413bac7b7184dd062adf94178ce853ae65d4c7
font_02_sfnt_off00015299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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