Malicious PDF — malware analysis report

Static analysis result for SHA-256 943c32ed184ede47…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 16:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3db84264e51e6e085ce26f8acfed4da9 SHA-1: 88eee7007e3bc8a43c3e691f9edf50f691d78c5e SHA-256: 943c32ed184ede47c93758bd0ac37e62e45dc484aa1fc116fb4033f748bcf403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing analysis of specific lures, but the overall structure points to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=samsung+galaxy+ace+2+accessories PDF link annotation
    • http://transchem-tech.com/Uploadfiles/files/71816136598.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/fujakixutapadaxojibasanex.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/jiligukizevafoxijif.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/gezupa.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/1048823604.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/jasagifawokax.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/46591959366.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/88181380631.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1a15cb9d---buvojivawomovabilerabepur.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/90425267851.pdfIn PDF document text
    • http://turatabor.hu/media/59564580753.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cae5d516e---moxifidexelu.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/46898912736.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kigitilikedoresus.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef03b22dfb---71255086943.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304dcbf0efc---punub.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ak4magelqlr8hcglgogr30cq4/vapujilubusitusibapepe.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/88091507481.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/31686790411.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/92533146161.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/50427708418.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/funiw.pdfIn PDF document text
    • http://cycling-software.com/files/file/robazegagovokasopid.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xopinekonon.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_off0000b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB646 10988 bytes
SHA-256: 9a213e283d67cb68fe8ee2628f1a81e7bd083cdad53f2bba74926d9ed24db370
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 15076 bytes
SHA-256: 3fdf91abef1fdd8a77426497baa5dff30189fbd5fa94e0b8405d103174d1b96d
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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