Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3c22eacd046caf…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 08:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fb0292659aa5f1069faceb6898993d2 SHA-1: 4e48a1892b5dcf5ec3b87e5d483bbf0a1c53a2aa SHA-256: bb3c22eacd046caf9ecb64cc6c70b81ed7d147e9191cd6bde3dcb7c9ed2a8388
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of JavaScript actions within the PDF further supports its malicious intent, likely to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=multiplication+word+problems+year+7+worksheets PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff23ace658---fatag.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd79adc8cd004587d3d59bc8e6bacfa5/lozitejowe.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/64952743371.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a4b28ab7c08e826412b6ba3cc1103f30/demivonokarubaw.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lisowilopokowezi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4edccaf6---sagunevigisimabiledo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4a6a8e482190a55a5fdf329823c1be39/99425632268.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/kutewemebe.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/82202350850.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/20607389634.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c3f0ea247593f460ba16b8de893d1d63/77140436595.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210706122405_xvt222.pdfIn PDF document text
    • https://electroagro.es/pub/files/88602496877.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/68330962462.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/gipawebixabo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/63640880572.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/88377226145.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/49992894897.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/70427825030.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/49082493566.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zigevemazali.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/tojaxe.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 11352 bytes
SHA-256: 3455281e5ca7714f8cfd2896aabd968a79d8a222589615244f3a7ac74c2086a1
font_01_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 17984 bytes
SHA-256: 81ce107139aa7802e7b4a3378829bec94d61394ea3dbf783d83ddba834ecbb03
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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