Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4435c8e6d8062b…

MALICIOUS

PDF

92.8 KB Created: 2021-08-05 12:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb56e11c874b7cc999482e524b405704 SHA-1: 5a92d071c140a02e0a3e68dd1c459d22e7d4d006 SHA-256: dd4435c8e6d8062b5071583277b6e97ea4b91fa6f7771bc2c48820bee4e3a38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://wastran.ru/uplcv?utm_term=best+ad+campaigns+australia PDF link annotation
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/favuvobobotalubimime.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/dawuju.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/35697336581.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ausiq1to5gcuqege20kc5ink3b/47491475070.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864a6de8150---90972043365.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/34154fbe125df36f72262320d200ccc9/93191237385.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fewerotadotawowotoxi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d6ede9cc5a911bfa05dac38826aca59f/62025674453.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/banabasoxedozezuno.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af5485f511---69815040583.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vaxuwe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c7f7f337f7181d76dd445e06aeae9a1b/25207397016.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/vimetuvojajomaxabugofis.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/fabiselunaregafulunadav.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/numudiketilonurevunut.pdfIn PDF document text
    • http://ahchala.com/img/file/nekatomubovi.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/xuvovikozanivakuboni.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52601858485.pdfIn PDF document text
    • http://cmtsport.com/pliki/16597559039.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i0qivmbdi2e0k4erjpfcaqpp96/kaponujodikopegugu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4e5c2d98---puxeroteberuluzuzu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8096279b1---giboponuvap.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/25630459202.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27999d453---xazepafadesuketebolit.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/banubonifolixipebino.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a182611d9---dilef.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/kaxivepokamimozojotiw.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_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 10888 bytes
SHA-256: 409fdeb0aa2127af1433aeab07a650324f768960e7a6f396d81279dbc9f1350f
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 17856 bytes
SHA-256: bbf347f99e3b4adcdd86b7d60c075e197d0fa2ba326445c0e5396e0011c982b3