Malicious PDF — malware analysis report

Static analysis result for SHA-256 97df35cf34243778…

MALICIOUS

PDF

86.8 KB Created: 2021-07-27 14:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddfa5804a203aa4392b8d882661b9bed SHA-1: 9dff4636185b49edb6d77b224c16b828fac07990 SHA-256: 97df35cf342437785e67b448eb8e81fbd6e570fa14156fabd0129bc1c6132887
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, some of which are compromised WordPress upload directories. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or phishing sites, likely as part of a broader phishing campaign.

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://zanhotel.ro/beficientconsultingFiles/file/25832425782.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/rarelibuletogowonox.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jobovolepamubanojarosubu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5d3e5e486f6023cd350fa24cecdb9b55/39091539232.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/97010728198.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721ea67611---bipexuruteridam.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3c9eecdc82f31d0470c75d6d2162708b/watosedalo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rudilasuvusanugabefifum.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34547600164.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607756168668f---xokimusurama.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/vomoraxamatilo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ca46bd34---15362974561.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f28319858---fekiwogutex.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/jalanoxozega.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/weguliwuxijefobejigisoj.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/29793513802.pdfIn PDF document text
    • http://vce34.ru/attachments/file/lawobolu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1067cd69d75222b6accc5071151b6b13/7310207165.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/40985247956.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/nuserewopazibukefugebi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44d857ce8---44392299822.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/lazime.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/34458830509.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/virifofumenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=westlife+songs+mp3+download+audio+songs+downloadPDF 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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 17136 bytes
SHA-256: f1cf53872d5eaf44645cdf08a7ea11c8fa95055e731ebee66ce4883f7aa9ced7
font_01_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 11092 bytes
SHA-256: 3d2225f5b283f827739b5f1387ef2630cb3feab57082a48761c67e680d1e012d

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