Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bfcfb6afb83b0a…

MALICIOUS

PDF

61.2 KB Created: 2021-05-15 02:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c2f4cb61c9b08000dc987d4c7cb3566 SHA-1: 03a1330e886d38b17d6d369af67c79e3ab3a6ee8 SHA-256: b7bfcfb6afb83b0ad27c06c71d9aa2973b4916fb63b80afd2127dfba949f9e6f
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of 'Byju's learning app for pc free' in the document body, combined with the compromised hosting, indicates a lure to trick users into clicking malicious links. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j0o46oe00djhmscs7smnso7vr0/robefedenolasapo.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d1758a2a5bc93fb0365aec71c720a51d/fibelobekewodavesusiwe.pdf
    • http://angarakshaksecurity.com/userfiles/file/demimexamizesebifu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899edf0d6c9---nobujixemoton.pdf
    • http://www.urbanwaterways.info/files/28270080859.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/44e2219318fb8171ceaa75054f56ab67/70872127340.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cs5r7o56n5kaqf83cf7njjuoq6/turatedemoveg.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2cf80f87e87a07778d91b5bdad6fab7b/97078501744.pdf
    • https://aashianarealty.com/file/wulijunetowupowumiga.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae44132ae---1728974849.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/91f541ee89caea8d805e91d2da1684db/82675041644.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907a7710cb2---juximan.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb05a6f535---viwekaxexagosowilolit.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c3a5548c7b5129e5682396da1bd57ac2/58500920251.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee876141c3---46603931211.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf68844261---82652859706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=byju%2527+s+learning+app+for+pc+free
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd43.bin
900c491ff52d52bf87a6c1e1b9253813430fa231a97e38298361eefb64fb0e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 5444 bytes

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