Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cbbb98ad5e9139…

MALICIOUS

PDF

90.3 KB Created: 2021-09-25 22:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f53342fb6749dd11bd40b802f0243ce SHA-1: 3143a7f095c91d763c84a05f7d822815e94b3c88 SHA-256: e2cbbb98ad5e9139b13bbf0269303bb3563d6c9edbfcb0a9d8162e20ea9e0423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ketchas.ru/uplcv?utm_term=%E0%B8%84%E0%B9%88%E0%B8%B2+%E0%B9%80%E0%B8%87%E0%B8%B4%E0%B8%99+%E0%B8%AD%E0%B8%AD+%E0%B8%AA PDF link annotation
    • http://ahrestygz.com/userfiles/files/20210908_220352.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/fowavu.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219121654219751.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/76122399703.pdfIn PDF document text
    • https://chp-travel.ir/data/file/93798348589.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/wuzavi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/7792760715.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/desibimavawazijizola.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e1b405601191620a95265d79e3a2bd32/gukafim.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/23292509391.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/roximoburawedorufe.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/gasurigawedo.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/69829220861.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/zamixeriwarefonozudabowek.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/vimibepamanewitukudu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/935bb9caa43d0498e426db6d5494a6e6/wokonukabafos.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde8da5f16---37182020381.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d48fb8ae57afca2c3936077868567348/97555241827.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/nikux.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/serad.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7tugmc9rg9jlgelsk6uq6d9082/65121079253.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/basugodirekiv.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77651085466.pdfIn PDF document text
    • https://el-tall.pl/pics/file/59390444631.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161440c18b40b3---66498747758.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 1720 bytes
SHA-256: d8aff93c39b05c9b6512c08c2d17fdb196d8701417f64edf502bb54278680133
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 17960 bytes
SHA-256: 86010ef2dbceeb77e796b8ae69bdc2e358523c81b508cd9e7cc2f399089a64d3
font_03_sfnt_off00014118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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