Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e233843f2c2abc1…

MALICIOUS

PDF

95.1 KB Created: 2021-07-27 10:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b2b70724c1097ee7e1f0b86e1420f4f SHA-1: cb245bf07c8831e10695ea8f9e3be67e53da5f0f SHA-256: 3e233843f2c2abc1698f0c11330a82d1593a20cb3cc0324a411c7b3716bd5b69
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://altonika.pro/files/fck/file/kelunojagavi.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440efe83be---18690150224.pdfIn PDF document text
    • https://wineart.online/userfiles/file/sawidubaluku.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/eb663cfa2cc209da2fe095b38d34d60e/jemexotesipida.pdfIn PDF document text
    • https://digireg.se/upload/42252707045.pdfIn PDF document text
    • https://soechi.net/userfiles/file/zisenidibofewijajoni.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/60980306362.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/77662109529.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hgh0armpgak2toksn858184uj4/bizupowog.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609c68740e897---kanobejusiberewerad.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/700f7e8d393410bb1fd0ec822eb509b0/78805152671.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d3008814c2059e4b30de087ab8d9e0c3/foxejasejob.pdfIn PDF document text
    • http://altus.pl/userfiles/file/zeniwusekogivil.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01f0a0cd2---24013834321.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/75902234740.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/23018728419.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a5889a4f---zowew.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e0aa1146---84266395956.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/74163149564.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10c14138aca5065036fe7c9abe7c5f7f/kelajefakesipelegurub.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6d7db573---pogobebujumeroxegopexakap.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cf09b719---61889984000.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wabole.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e57b4e39ebd---63732278909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kurtlar+vadisi+pusu+t%C3%BCm+b%C3%B6l%C3%BCmleri+izlePDF 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_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 18276 bytes
SHA-256: 0d4163edc497be55b9dacd5a468b7918a48c8c49f203356e1a41a207ac389112
font_02_sfnt_off0001533c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533C 11092 bytes
SHA-256: 3995db093a088f98a9e8675f9b9e1081c17be6e829ee5d47673e730c58f31d3f

Open this report in the interactive analyzer, or submit your own file for analysis.