Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88c194103f1e9c8…

MALICIOUS

PDF

84.2 KB Created: 2021-08-23 12:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bd9e6997962b03ffa45930dd442098c SHA-1: 33ed5a5492804e4f244a13e69daad6605b76e111 SHA-256: f88c194103f1e9c873e9dd5b3ac802e9ec2059047df5723ea35d4f93655110c8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution, rather than displaying meaningful document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=native+american+tribes+word+search+answers PDF link annotation
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ee4fdf6cfaaa3efc5702a45bab426476/dexujome.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64975bf43---purozujuxoso.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/2998d39ada5fc14afb71cc70d2df7a66/32396790824.pdfIn PDF document text
    • http://biomehl.com/images/content/files/muduzulolovimano.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/72247715355.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gcrlmusog3ss0q7k68jdm28o5a/65237007338.pdfIn PDF document text
    • http://enewind.com/pliki/file/48509192730.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/47419469482.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/p23dvr53m996n90n7r43be315t/84749042569.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/9691481006.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ad50f9101440858958fc9ee02ddf6680/90066889510.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/fuzenirukinuwibajajupu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160747a4871190---moposazozumozi.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/gujerisasefuzofomaz.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76459e3f9---fetematazorowuxa.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42921733765.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/97832995253.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210625/file/16246035048930.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f553b10149---luzeja.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/gulururijunomejirux.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/zumokizirekijudobixasa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080582f6a787---42822246785.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/98448759177.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b2ec5e0c---89357680444.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/tisolisokagujusogezupe.pdfIn PDF document text
    • 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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 10860 bytes
SHA-256: 09b315512e1632a3120e2ed603fee0a1f5987bd06319314a814e2f1ae9e69973
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 16632 bytes
SHA-256: c64ae4c596f5e92b4a650ad3e940ac0e7890c7cbacf8a9a570eaaae46718a1b7
font_02_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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