Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6c82107cda5786…

MALICIOUS

PDF

90.0 KB Created: 2021-08-17 03:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2908a3f8b183d74432dddc0cb32239e1 SHA-1: b5c7a60d5667d3c0fc5f387ce6963c03ce5e1fb4 SHA-256: 7a6c82107cda578675d569add0df0dc924f976157db0a356b24033ead057059e
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=chhota+bheem+aur+krishna+full+movies+kirmada PDF link annotation
    • http://millecolori.it/images/file/sorasa.pdfIn PDF document text
    • https://dm288.com/slicice/file/74600594612.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4ea8e600---tisaloxasi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef874446f---48838323517.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lanudeviduralajedales.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/gidamuginofu.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/wawuneretavipufumaw.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116fd0c48c1a---xagulinanexipugutewafa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/91268691838.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075324ca1f52---85241464906.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cced95c636ce46abdb69bd8c7bc16e98/39137610318.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/s33ns3qjv1mkvc1jn70q4873c8/18785632731.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/wasimepur.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/gebefisipaxo.pdfIn PDF document text
    • http://wamer.org/userfiles/file/wotominaguvidevawusu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/97980288225.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d44ee60f813---21047838936.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f429eeea1352d82f1b095d6a23d91f32/68792759375.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/81d388d09244a23ae1ac37b4e67f5100/84204328908.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08d24992f---zejokivakapux.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/37613279562.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kedol.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_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16952 bytes
SHA-256: 30b72f382704e9dc3a40f534f6742b2d4212e333e9d60e8a1df0c8be1d45d5e3
font_01_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 11048 bytes
SHA-256: 6c6fca7824114e5aa137a51308f291669d0054f7314ba5ec13fd02c72cfae9d3
font_02_sfnt_off000141f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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