Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daadb5384cafc5d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 14:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6db4e2d123dc2d28209775b59be66e1f SHA-1: 1c9ce0ee7d27d8ddd7bfa1d7bf82c1925a95ea03 SHA-256: 7daadb5384cafc5dcca5c48516310c57cc738cfbde638029ee2fe12e74250fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=acro+software+cute+pdf+writer PDF link annotation
    • http://media-production.net/admin/ckfinder/userfiles/files/sexoga.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/td38orekaf5oftg1qo9holllp4/dajifukowubuzenegiwikit.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5lihul9n640lnf6bsgu8ghn6d8/19378132371.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/wigarokosugi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/952129791a72ba34ccfdc70030c9ce06/67808011386.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d2efd057643304dd0cad6120ced659d9/gusufilimek.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/20846734301.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210718214450.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/tinefagafufawanugolom.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/nulekenoxi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2344539278.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a063d624b91---3707476973.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e44d4f0e0c97844474cce0f137115771/31860831005.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/54120552520.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/texuvefejafewuneterapet.pdfIn PDF document text
    • http://dentistturkey.com/image/files/gazewufu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f048b058fa43e6343c49757ec39cfb3d/jejevedisivirupezuzubipi.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/ziloranakamupiwu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/35035805057.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd3f7d698---24687466168.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b9cc66dfad9e660c7847bc4dcfd9718e/93506171220.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d69ab2d1c---damubunovovonimuzatasen.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f788be212f---nekukokawovi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/weginiximazalunuvojibix.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/29821118146.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16104d4a89d980---fuxezu.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 18100 bytes
SHA-256: 04895036c390faef5e67f8b0c4564ca47c3b11bf78303f2c3e8a9cc6af1d7a7f
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 10632 bytes
SHA-256: b8763c4badb46651a0dddee23164a8e35d80ec1bd137a85a15fe3376fe73d2a3
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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