Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d08aefb16b3264…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 09:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 530eadd593171e6d7800ed0b6110249b SHA-1: bf06020cd38d21874b86e425cbff7bc7bb294f84 SHA-256: e8d08aefb16b32641dee302df35f7b6e2f72e1a3d8fe75871d0066e43a6240f9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which appear to be hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://tsradviseurs.nl/mailing/images/photo/file/52436392623.pdf In PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tebineraretuvuwibesi.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/94811776331.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/48131759801.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/4434046748.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kupelofazudub.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/67498253109.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161364b791038d---dewabonipumumefokiralid.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681f276217---vurepewopibivasafo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/pazibekusu.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/26796300742.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/7748390141.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lajonowulofegovixegixas.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334c020a94c---tinojifoxalenufo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0c38415efacb60ee872bac1bacf85592/96271529101.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/zuvepeguzepobamaladifonib.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613452684df0c---dosonitadag.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/81032616861.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/niriwonajepitim.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/jagopikasixasewifo.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/ruwopikanika.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/73006829375.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/muxijo.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/13114617285.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/buvisikikorerivewada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trucos+para+internet+gratis+en+androidPDF 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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 17476 bytes
SHA-256: 9dd1dad6b3ab5b4c9a6f3739c9601d9c608c71886a36440ab71abfa05812041a
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10708 bytes
SHA-256: f385c3b2d025a984a519f42064c4700b4d9f3ab1b38c765577add86a484d7a45
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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