Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32b1abc66d1c39b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 23:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0b048d939d7c5322f0a6e1d3ffaea94 SHA-1: 3c8dd19425302b0f2deacd435338c65729553395 SHA-256: c32b1abc66d1c39b38f44486cd9fddb9684542a4b6551f9b788d8c7681be223c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52e22cf21cd75fec8544eecb124937fb/delodelojosiditokonig.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e954b421da---42666494598.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a18e29a1b---wenurolov.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/90967249181.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108200803357184.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/jobiwukapunopugixa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lo7cl0b9355hrl5bjsp14bj466/rejur.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2eb9cdbda286c0bf19f59a1e64ed55a3/tizawizonexolotakiziwi.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/40505844108.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916bd2185e1---dewijufowamitide.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ee6f3a7ed9947b698374904dd9d9cb9a/piweremivariwapamoz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1fb4f4df---jewazenam.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ruvukubofonugifijasuwe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/latevuwuxubez.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d336193ad1d---26102463321.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9ecbd48cb48cfa745978e0d8394a0d47/64139009167.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/75931831218.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/10508228551.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/42860983727.pdfIn PDF document text
    • http://atya.eu/files/file/bejiduti.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7daa549c39ce949115440483e1833ef0/31655762152.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/596ac118fb3a4d840447e4b1c379fa86/demozifezu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061905553123.pdfIn PDF document text
    • http://dentherapia.hu/files/file/lunikiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ringtone+game+of+thrones+androidPDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 18900 bytes
SHA-256: 124ca0ae36ae233623d09bdf1fb73a4843e89ac86aee1e8a036313507a91c139
font_01_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 10800 bytes
SHA-256: c4afd9d7bb2e10883b0d53b8409a2ea31e818d44c78fb39c907732a63c989c8e
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1