Malicious PDF — malware analysis report

Static analysis result for SHA-256 0beca8e2e5f00fa6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 16:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f61c6654760c1e0935b25908e824b66 SHA-1: 1a0f1c5f308f5f1e8cb348a41f45fd6ba3af9f76 SHA-256: 0beca8e2e5f00fa6c96dd0deea718f797a31b9c6dc3cc79da064f80c341192b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=auxinas+naturales+pdf PDF link annotation
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/29adcc5565d42b92866079c4ff05bf4a/51272210695.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pgooku1pnut081e8o0o0c1epbb/dofapuwekegepasovatak.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/82129381479.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/crv5i0i0e083cgm20jql2a5uj6/10697729580.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/tesifotojose.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785b858a557---17006746882.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d474f2a959---vifixosanivawojufiko.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b3e8c62d---95116196174.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zugifidubotatu.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210620014945_8stdkv.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g3kmcq8uof3juotgglgm7nfdn4/minonewunif.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/mesenawokaserekotode.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/63485918498.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/gikunagefaxezejukusove.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/8312929359.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/valodanop.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d2d31981---85963346772.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4je85d3ud3vh8rtfgrv5kdji16/16341732250.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/21722895537.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/simitudeso.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/21536416883.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/63171156177.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094722be668e---69941209806.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulanozuzavukediv.pdfIn PDF document text
    • http://www.moyekolodin.com/files/12994556605.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nofexalorudomuvuwe.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8621c2a7---podebosenironuzowegu.pdfIn PDF document text
    • 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_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 10556 bytes
SHA-256: 4465a29ab867fe2852d9842e7664e884bde54f8ab131c285609b931777af7b6b
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 21272 bytes
SHA-256: 2bade955ecb26398a99e752afa6cc6dc1de514c6e55e3e838e09f0ac95aa55df
font_02_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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