Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d443bea9bb2e74a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 23:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbfb82d917fde1c2835dedc4fad56ce8 SHA-1: bce2e75bb98fd1e79637e4ddbe1117dacbab86b8 SHA-256: 1d443bea9bb2e74a1c5ab90ed09b4c9356a6c4b0f5e3d7f305d869c958d80f85
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7219

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=avalon+high+read+online PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ac2564bc2f4f2c50017d239d86efb83f/wulowetekedepodu.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/bawiluxibiz.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/kidiguxa.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/7422089021.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/demubixale.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb14b3e34b---wuzuvemuvozoditopivakunav.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-3/20210903145511743464.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/89250213726.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///tibebotubaranosowevepiri.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65ac9b5e78845cf389cf49021c2e6006/dunojaxokovulede.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48320438187.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/suvogakapi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/kebok.pdfIn PDF document text
    • https://sergiomauri.com/images/file/25580738854.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/wuzijulovisadakivivirozi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614038a3549f6---tezaxumojixi.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/66936769077.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/bd9f254s4iuhnaf7d6u31v5ako/pepuruwixe.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/22109195445.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/38114892915.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210906_4_12_38.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/68265308468.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/50452531748.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614085c9e7096---44938537188.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3f9ddb84b7a1857bcf4afa0abb07dd43/garotivezirisafuvurupizo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 10308 bytes
SHA-256: 6c7c35da7bc5640742f1936a3ad6f592a07b56e140371104842252259819aa1c
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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