Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec39643da3b902d1…

MALICIOUS

PDF

71.2 KB Created: 2021-10-09 17:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b43b6e83cd25a7e82cb14afff403cc89 SHA-1: 4f47549880546afc60d8375e1e3df2a0d388dcf5 SHA-256: ec39643da3b902d183ef8911ef064ecdcfa36effc847a33cbbe203b58fa383b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads, suggests the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to act as a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=mare+race+horses PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615aec2672767---20821434372.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/7a3a98824b970c897cd7abec0dc393a8/63473911976.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/dobesivojatoxaze.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359f00ceb6c---46074233371.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/46276006683.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/xitijirokivomopamulo.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/94119750014.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/xiwivikiborixopiduloravi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/616e660c6f4ec9537e303428c2fbe089/memofasoku.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161360348d2ceb---gonivujuravexawaxegam.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/gorosonegalemejavelesevav.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0ebd199e2---wimowijomukagu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/63347416225.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/fuzakedemaw.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/95310198154.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/24070298247.pdfIn PDF document text
    • https://inarsindbari.org/uploads/48136407244.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16151cb1a4371a---paxanomi.pdfIn PDF document text
    • http://sinners-party.de/media/file/27079284753.pdfIn PDF document text
    • http://varvshistoriska.com/file/75838396158.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109041756393412.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/78868844396.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/divusog.pdfIn PDF document text
    • https://yummyschool.com/_UploadFile/Images/file/62963091164.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/bijopugoduxane.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_off0000ba59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 15260 bytes
SHA-256: d37fd77bb62eda71c21b4eee797ad63b5e96ca761fc23860861b3ac718462b7c
font_02_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 9980 bytes
SHA-256: 9a011172fb49c77464c14299d796246eb048271bb4747b10e253ec1597dc91ba

Open this report in the interactive analyzer, or submit your own file for analysis.