Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d6563a17b27c44…

MALICIOUS

PDF

79.7 KB Created: 2021-05-07 16:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed043888eb1b43894fcb793407bc66f7 SHA-1: 44fcad2ebaf66887be561ecb6cc6a866020713cb SHA-256: d9d6563a17b27c4474742ef52fa2f33b19f130920b4f55434d6ab19191c4ea50
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ddiaag3d7nijrn26dfp06gld67/gutezifulosel.pdf
    • http://absolutelyneon.com/userfiles/file/44640982670.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d887ecb154e5e9dbc442b645ca5ad198/sezogabaxeti.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4crocboitl4ap82n92l870tlgq/pibasunudideluvup.pdf
    • https://alihuata.com/userfiles/file/duniridanetanigi.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/90ab23e91c36f7878a70b1fe6da0bd0d/sogejoxepadu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d50a1577a776488a36b07e9b64aece98/samulalizevixelub.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749bcd73d68---tonuzunenup.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7cd8ff1ed27b7cda6da9e3c572b48fb4/posorizafaro.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k71cb878gttnbg879oi3a52g39/68376911157.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8a487a3ca44b3547ba4edee5b47df0a4/jejixasazenane.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b822b68---tuzesiraxibobaz.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ce064a15---45392191758.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f433613445---fidepo.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/28d7a16fa3eb1c17a32109da2d966417/sowunevijavuxofuzejotes.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e56ce63ed62a4aef7b8a04c2890ae4aa/ginokawoxumawobitivetaki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=discounted+cash+flow+analysis+excel+spreadsheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe53.bin
f9a8344fca92dc12b5d9d510ea4e5a10770aa735be7cb5c63e45f84ff168988e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 5504 bytes
font_01_sfnt_off0001112e.bin
b0850d6a023c1353780e7bdbfe94d03c0effece76747e0370160c03760471128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 11264 bytes

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