Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a50ba779cda6404…

MALICIOUS

PDF

90.0 KB Created: 2021-09-08 03:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afead42c011a10cca57ebd95ca71309c SHA-1: f5fb8413bc8086427eef54c65d4338356b9416cd SHA-256: 4a50ba779cda6404ea4039fd04a177ce2d453cc4c250995deb6594c54353f3dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=nomophobia+test+pdf', are likely used to redirect users to phishing or malware download pages. The PDF structure and the nature of the URLs suggest a phishing or credential harvesting attempt, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=nomophobia+test+pdf PDF link annotation
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609477fd09658---52522898383.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/83921044581.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/beninipidusugodojepi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/lamalunajesosasimegefufe.pdfIn PDF document text
    • http://df-2.de/images/daten/file/50775339232.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021713621273790.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/18291036900.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/feledode.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/koxurobibugokiwexulaseset.pdfIn PDF document text
    • http://planbmedia.hu/files/sitideradozobesusix.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096baa48c616---12598395603.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/53045865339.pdfIn PDF document text
    • http://contextuae.com/resimler/files/93822328753.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/87241bff9d35aa1362378544a360784b/53901022449.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160961a4f3c152---nupasinefa.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/nedipogurerupakupekuzefe.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160811998e7b4f---21617970851.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lapanuwo.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pulif.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/aa9e8905f5d56d772ae0990dc994e8ed/25949930871.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/82249436951.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/96077772325.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e2a81ebbc296cf4e7445065554b735a7/radasogowufolubeduge.pdfIn PDF document text
    • https://goldenapp.net/file/tomugevodikakuluzafamumev.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 19144 bytes
SHA-256: 6eccd3046df70c280f5bea447aa63c5f1733c47c57a2423446ca92d8d01b2696
font_01_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14200 10628 bytes
SHA-256: b8d78347e89fec823a5a406f7d1664052daf351396615dd451000db475ef8909

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