Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad56d05f002e57c0…

MALICIOUS

PDF

96.0 KB Created: 2021-06-25 21:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 285b2b1941710f7458ff72f36de29483 SHA-1: afe3d661ae6012e84c07ff782dd1d027f0cf3c7a SHA-256: ad56d05f002e57c0e88d2f6ddd7bc8a51a31b3c129d5ede5e5937b13554e9724
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. The presence of numerous external URIs, many hosted on compromised CMS upload directories, strongly suggests a phishing or redirection attempt. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document content likely impersonates financial instructions, aiming to trick users into making fraudulent payments or revealing sensitive banking details. No scripts were extracted, but the overall pattern points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://nomylo.ru/uplcv?utm_term=difficult+conversations+book+pdf+free+download
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/16uss925flfbe5ad7u9mb189do/beluwemipapu.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3f1721aa73e23bc76fec842aa8bf99b4/95903986485.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/soxir.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d2bd91e25d5b5ff1cb4c205e127a0bde/gupape.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160989c22e2a9d---pevufisamuwituzejokexal.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/20b711cd4fe92ede18c79a869339c5f5/murewixigav.pdf
    • https://fedico.ca/upload/editor/file/13545786402.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8a47b3f57055de72aac4f3a84a50a21a/mudibunozupen.pdf
    • http://ned.ru/uploads/files/gopaxapuzokufumojeb.pdf
    • http://myucpb.net/userfiles/file/25178981107.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076baae07806---14075198051.pdf
    • https://usssecuritate.ro/userfiles/file/13262554433.pdf
    • http://vyveva.eu/UserFiles/File/50338423832.pdf
    • http://abwvictory.com/uploads/files/4813095918.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11ef2d9d0---jefogijuza.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d611a2d316---9161194421.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c913c64509---76011060198.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e8500c64a33247b432f3ae8860a26122/72797129245.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5e9cb79fk51cra7sebkjio6kc/26986559942.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3334892e2---kotikurebojel.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a7124d13---89197737422.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d932cb3194---ditis.pdf
    • http://yossy.biz/userfiles/file/4181157550.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105270830145882.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011281.bin
5b28926500a911f929d2ad055988a1238c9062126dcf5a37faf592fc02df49e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 11096 bytes
font_01_sfnt_off00012c5f.bin
2bb4eb50b2f262d860b5f87c3207637b0f0a74e20dbf8c7b1372e84aa61e3925
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 17724 bytes
font_02_sfnt_off00015a76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A76 16792 bytes