Malicious PDF — malware analysis report

Static analysis result for SHA-256 787c739fce67c8d1…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 13:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68c60b164e2a342dd05e4d8c86dddf91 SHA-1: 3af812fc80d642b46b177acb7c19cc1f3a23ffcf SHA-256: 787c739fce67c8d14c70053a1417a692a4d50d44ee033ca179ad9f365f2d53c6
156 Risk Score

Malware Insights

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

This PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=shadow+fight+2+titan+hack+apk+download PDF link annotation
    • https://fotojursa.cz/userfiles/file/15031004008.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lexomukoxavegef.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/82578200499.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139175f866ac---lopevoxufetovodotisuzitaw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb621078c---jefajojawafekapusiroxasop.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/75547142107.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/nuxifolir.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161417a172ac35---sarafupujezopazojuwoti.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/72430618758.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/temevikipoluvopodaw.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/wixasamasitusukisokak.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/susurodozorojisaxoxonujep.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdccdd3c0---tesatowabariv.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/16688582462.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/96113142189.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/30535799480.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161334c41a06c3---zetedolatopavijiwizano.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/milugepaxazefagosikepi.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zimosabavizinarotemotitu.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/tonameg.pdfIn PDF document text
    • https://apra.pl/files/file/83478401368.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/pomupudupigixi.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/65773757936.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80048915823.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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 18108 bytes
SHA-256: aabfed8f6167ba7e12895f1faa841329d3f7a5ebc12a1f873e93a06d0a16541e
font_01_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F21 10872 bytes
SHA-256: ddd35f3884a4616a355a0d6a9effa73ce27cc8327d3ed2ed1c2edb530b0cc22e

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