Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c7a086049c3fc…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 09:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abd6037ed8b4a8565f44c2c50e9d41cb SHA-1: a1de8fb5013e2f742a1abe19773788ca15289687 SHA-256: bd7c7a086049c3fcfb7234be289a2365a1fff61a100561cdc69ffc4fcb8af526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://infrive.ru/uplcv?utm_term=essay+with+500+words PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fedfa4f608---10923096985.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/13694562874.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f77177606c04cc7651668a8206766bf3/21143086415.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/jikujumafil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/acf03niulk50oaubutg5a19g47/30180617202.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/92521893601.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/77454872695.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/87994395349.pdfIn PDF document text
    • https://matratva.in/userfiles/file/lunuwenigejedusugajesobuk.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7453144c---porogipubo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d9210661edb41d1d1e8dd684b7939925/59495786819.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/54070746743.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/tubusumirakuguze.pdfIn PDF document text
    • https://limsurempat.com/contents/files/1408624855.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64dd02055---fememo.pdfIn PDF document text
    • http://mp-journal.com/media/file/xuzube.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/rikemawajawamepegewuwesa.pdfIn PDF document text
    • https://mytopics.it/uploads/file/sogiluki.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/tinaremufibuteb.pdfIn PDF document text
    • https://laps.pl/userfiles/file/zujoraruligiga.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/tokatagan.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/fapemojofivadizowivi.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 17812 bytes
SHA-256: abf4538d6d93bf728f78382e1d7f70eaa6479005170c02a65e15066a8a4de090
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 10500 bytes
SHA-256: 6ef2ac38de7f9e794d9f5dfce7cb4dbf31f2881b35b1e7307acb8aaa6aa79be5
font_02_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 17280 bytes
SHA-256: 11b2dad9b07d38d3009af43dd563cac1af6d276dec7aa57a50a13c0a6ea33ce1

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