Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd4967802d80798…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 06:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af127045c9350aa88a2f375ae9d8c137 SHA-1: 064ae748ef7d17599213bec8733b3bcf3a2dc673 SHA-256: cdd4967802d80798f3febd2bbe4cb8f66981fb8c65b325f50ff936f84a3a28d2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. The presence of numerous external URIs and PDF link farm indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/uplcv?utm_term=descargar+fondos+de+pantalla+en+movimiento+para+pc+windows+10+gratis PDF link annotation
    • http://worldnaturalfood.com/image/upload/File/tuzonefutotus.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/36155666988.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae074b16a77---nivolufudipebeg.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/58175033894.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/62255697218.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/deziduxodugigalezanowogi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cdcbd846f---60584780424.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/fewudireb.pdfIn PDF document text
    • http://aweibel.com/Photo/file/zovakaz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c656e7c0d3d---noxin.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/36147398221.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/rowewiliziwofawubuje.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/97219891343.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/kodefugezexesezuwav.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/aba38a709c260a3e0fb21fcdcc92198f/99313103612.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609445c739747---31686046726.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcc47b433---mawanopafawejuxizi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953bc9c239---turenugedezused.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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 11292 bytes
SHA-256: c93edfa9b71aa78e211fae220455cce149535fb5706c5f8e80392ee8d2062d6a
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 17440 bytes
SHA-256: e2e33fbb90b57ba4f9e676b5dec08b53b0a4e5f2e16a65a5ae21a60522f01bfc
font_02_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1