Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc994bfac34a5b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 05:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12a4b8decfcef4cd54d9e2f7b766a2fd SHA-1: e1826266baa257b24df4f2309f29379b84a5d258 SHA-256: a9cc994bfac34a5b7a08fec059824161fdbf7509adc3807de8908f7a30c209e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://degrossier.nl/uploads/file/69333869759.pdf In PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/burunupipi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1315ec201---10337202422.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/wuxugozitisonusugezowuze.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqcl8gq9p9rftolic3bn7gk6s5/lumezeloz.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeginomovovupekupokifexid.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a3ed3d066d99a90894bc7b322b183677/tutinagofuxamag.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/rubiruxebalewokox.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/54091918714.pdfIn PDF document text
    • https://mbbs.hr/files/878176867.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://maurinet.com/userfiles/file/wifupukuwil.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/mupabuburetagufip.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecec06a649---zaguvemukizopuwiwax.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/78095737814.pdfIn PDF document text
    • http://baoveantam.org/upload/files/30397536527.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/25544811713.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/zepopubirawe.pdfIn PDF document text
    • https://edex.co/userfiles/files/14763239306.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613164bfb0a36---xopobewaxadu.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/18066389395.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/26964224176.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a4e0c397036d2b454184cff4a7826343/rakakufakafawopogufozu.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/26743838074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=world+conqueror+hack+apkPDF 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_off0000b666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 10584 bytes
SHA-256: e2c104962c198aeefa77b76c8b444b857c03d35bdd4a0a92a50922c08778c5bf
font_02_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 16816 bytes
SHA-256: 4f8d010d3a73ce96af09d338153d1366aebe9a49af613497b414267f0d2b3d01