Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c61a8f9e2cd505…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 15:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6a03f42a0ebc2017c3a03359ae2a229c SHA-1: aae706c7a92b562e01cbd0a418c18ef44d357a17 SHA-256: e0c61a8f9e2cd50549e2cc38d37efdc8ae2d9d2e90ed3166ca0725e394689306
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=koralia+smart+wave+controller+manual PDF link annotation
    • http://taxilitomerice.cz/ckfinder/userfiles/files/12346733743.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/82402579aaf7c0075a4c58bf18ac39d8/53869362033.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/iobvnev0cndphpjrc9neoh8ptj/xatesopuxomogakaxutij.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713715ed6c1---mozujejonuki.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2eeeae0f19b32900abeb9c6a223edcc3/49216223471.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d52d7d346---73287268839.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f3dd8624---wubedujuxip.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zolonujuwibibo.pdfIn PDF document text
    • http://hibertek.com/image/files/20210612_091819.pdfIn PDF document text
    • http://cmtsport.com/pliki/12787783178.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f7191df74---podorugepozesiwidatelisa.pdfIn PDF document text
    • http://thevale.us/userimages/jeromivuxesi.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/tojonuf.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/68794502429.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73f0d75c4---51028898274.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/9543597946.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/razowetogot.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/95187915689.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/mujtfjhn29c9uvs7mrq1hjsp02/22823395122.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/wejopininorab.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160eccd4c0faab---siruranudejudapal.pdfIn PDF document text
    • http://ausafe.net/images/art/files/lujikefokutawebagigab.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/14102974460.pdfIn PDF document text
    • http://kelvista.lt/images/files/8489518465.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160866cbec5a44---poxexedorisetitapabu.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_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 10632 bytes
SHA-256: 84cff4954f4e45559647ca5600070d4288dab5f3625d2c6b2e96c02d897b7f73
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 19552 bytes
SHA-256: b5b9833e9efcf6df347e036d37cf3c6bbfdf837415806b9756e65c3f3133618a

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