Malicious PDF — malware analysis report

Static analysis result for SHA-256 a781ddd9466fbb7c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 14:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be87c4cda7bebf322105bd89a02e59ef SHA-1: 04b78ffa8bf0cfdacad06a1c3da7abae08d115f4 SHA-256: a781ddd9466fbb7c4e64de0fffe0fd8bc6b3b1a22371440aa92b7a8680afd4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The PDF likely exploits a vulnerability to redirect the user to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://binarbaidrealestate.com/public_html/userfiles/file/sidowemezipunuwob.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc55d272f---99712894976.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ce32e3d7fe5f3a575cf9d03f03af4203/kuzorewaboxoliluguporenok.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62609695---12419014178.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/34b3b8d8932833526c6a7e46f4e5c0de/laxirejorebiduwobawom.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/48203506250.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608706fb8ed3a---sufebesamigijiwulojuzuf.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7586cefc3---3334441355.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae7539600---65008551668.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/rt4f9pdb5oodsd96fgbb28h6nc/bitawepokejibedenu.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/78531640121.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/mojimenade.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160948037c2362---31185522464.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lg2gp2r0ukjglp2edr9b6v79l5/sogabalitominomajida.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/bopixa.pdfIn PDF document text
    • http://yanartextil.com/firma/files/jefajuwavunolafodazod.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc2b10d771---mirugagisarowedekug.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/32243842886.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7bca50038196d55d3cc387163c4d19de/84216121324.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/28654191591.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21591795792.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/tupewom.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7ccdc119---luxokesibenejusonofuxa.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/gufajomebixenu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3141b47a79fc534e71c03cf0c8889e88/25439069523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=essential+musicianship+pdfPDF link annotation
    • 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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 18396 bytes
SHA-256: bce5fdada198082b9ba0163fd3d01f12f15d48594da6f65ca2fcc33096cbc59b
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10748 bytes
SHA-256: b8781b45773bd3e3da8265ca1dac57ce1b46fbdbdef875b3e4a589b451154c14
font_02_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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