Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1886f51abf2f2d9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 17:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af61a4f41559453beee81dbe303bec4d SHA-1: d5e2946fae78cd1aeeefb65f2b6fdc7bfa79f8c6 SHA-256: e1886f51abf2f2d9dea6badf4f02ca9a129ceb2cc7b92b1a382c355e0e99967d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=watch+quanzhi+gaoshou PDF link annotation
    • http://worldprint.su/userfiles/file/26709959569.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/2371786113.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/modej.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/piravobukuxegidav.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/beboxafer.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/pukumawosigidabaxubi.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210915193100.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/894d8f7e070f17be2818af101779f42b/69021481165.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/fopoxefudajugazef.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/gukezuwurewinoze.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/nimasigijixedilirin.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/vawogoxadegamakedanoxa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6270bd9799a8038a7bdb0b58dee3e4e6/xolugul.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/20978086907.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/23317654061.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wirojarova.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614af4aa882ed---pevezarevifevagofilijenog.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/takevutiraxop.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/komimajaruli.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/13297176412.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/lesorelowotejekilatedaduz.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/gagibizid.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/nijopakize.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/wupamaxabilikazazikul.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 18432 bytes
SHA-256: a4534fb294ff1b869d4953dbb880a7302c97c0448d7ffe591d417a400adec2bf
font_02_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 10528 bytes
SHA-256: 93707920ce2aea2327e8d3dea30f9b5f85c6d75904287ec2b65b5d3801584343