Malicious PDF — malware analysis report

Static analysis result for SHA-256 063ccebc2c72d9c5…

MALICIOUS

PDF

88.5 KB Created: 2021-09-15 16:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b23f3c571b862fe94496fd804158170a SHA-1: 1668303031d93c7fbaa2292f73fbe0c63a340a5b SHA-256: 063ccebc2c72d9c5a072587528bc8742b10690f650e56bbf974a70b00ec66023
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=nintendo+roms+android PDF link annotation
    • https://auto-rujo.com/images-editor/file/37186404123.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/zulakuzupiribado.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109022056251143.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/lijuwenosimu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/xumuzesimaremomi.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/pevabejinenexiwivana.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/45857189880.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766f1b06---11610603022.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161386e4a16385---28168505437.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/wabomudukap.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/60730923476.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd373d3d89---56758419870.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48207077976.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/nadebelo.pdfIn PDF document text
    • http://kvrhousing.com/uploads/divevagonivorowevuf.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906092126.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69684621869.pdfIn PDF document text
    • http://khocabien.com/uploads/files/6555249124.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/60380283330.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sumupi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/26957138645.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/95574733035.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_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 17632 bytes
SHA-256: 95a60944e1b7367ee32f0f1573e5887833a5a20b82b27a815151792175105567
font_01_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 10340 bytes
SHA-256: 2cda39b2d58a3324789f474b319bb9a6e2999d5b6ff6440151bf8a414838f248
font_02_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1