Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac39d8b6e101251…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 03:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 830970b7751851af1b2bf451429708bf SHA-1: 5320a3a401a75e8a920a54f99c3595257a277fc1 SHA-256: 3ac39d8b6e101251fc447249d4d6310f4e2b11034edf3c7ee4e4fbdda7c015fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://anquocrealty.com/uploads/image/files/71239443518.pdf In PDF document text
    • http://cuuhoatudong.com/upload/files/nojarozumupufigo.pdfIn PDF document text
    • https://deepex.hu/hirek/files/18858148976.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zamexakovuputero.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/jixijeko.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/35650149945.pdfIn PDF document text
    • http://santabruna.cl/upload/file/15666033311.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/wuwaduzodeve.pdfIn PDF document text
    • http://delve-cr.com/uploads/86926257309.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/79748425849.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b2c76d25---detonuloguxurobolovinaw.pdfIn PDF document text
    • https://lecachet.fr/docs/files/34067134026.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gunatosarudal.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192915265189.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/zixatewereki.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b761f889---83916242149.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/58620006308.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7b9ab102b220e5f08d8c26f31c3c21b4/36463662654.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/repugavoputotefil.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/66804225555.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23bb10548ba4c6b017b77d55184ba56e/gijikigefo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/67302291638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=grand+theft+auto+v+money+cheat+codePDF 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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 10752 bytes
SHA-256: 19b5a0b191e911a61bf359a2096d6aa9a9e2604150cdc65cc0bc61849b6fa321
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 17220 bytes
SHA-256: d2310ac7c9181d5b53b7b1ff0e193006349af9e07bf2e479f29e7d71421f40cb