Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09df5db4ddac22e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 15:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 692643da9f68f9ce3b8c89f3ac739771 SHA-1: e3c418f8cea5c7858da6d76b5dea38881206671c SHA-256: b09df5db4ddac22eddcb9e18e69c5204949e0b1a4e98e5e0b302ac31e085b8f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious content or potentially download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=best+vpn+to+use PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725642539a8---6961284831.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/n2i08sim1bm0hpo80n3gjlmj6p/70144618701.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rv352jekj37mqvutkfior50mon/bifibikejavepa.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/11656608141.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/51566393178.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/wosulivusemek.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/detikowiginixikitamevere.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061114290114.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d7b21ff987567f8ec8989dc6d5684527/94659292486.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021542232483551.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e00152b2c40---dotajigukotudazomakagif.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ab578276---tirizolokolejo.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/nuwaxiradek.pdfIn PDF document text
    • http://yuha.be/_files/file/67001653809.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/58346846427.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kinirugexiwa.pdfIn PDF document text
    • http://specimport.by/files/files/24287416065.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/6287175325.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/zuwonaberezinogebidaxaga.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/surogorojixalupisoloz.pdfIn PDF document text
    • https://lapdonline.org/file/nobemujaxit.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_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 17804 bytes
SHA-256: 3555863ca01430280535b7c81133707db2eaec09988d2119307bc17e9f7245fa
font_02_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 10064 bytes
SHA-256: 7822e9dfa02f50cda200155393b1fc468760bf93f936801e4d8d603e607e4ea1