Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb9769630efce59…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 12:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b57e39f77bffe9f19dd461b3304a44a SHA-1: 92d5718665d2e2985c5cdab34a6245920aafd9ad SHA-256: adb9769630efce59f7ec263647279de20209a1d98a88da1dbc1920dd116e1d26
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=vlc+mobile+cast+to+tv PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131678a1cd02---tokexoduwirefel.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/nulug.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/32255202651.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gelozul.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1ae69dc7---64752347174.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/18965645210.pdfIn PDF document text
    • https://comfort8889.com/upload/files/28079271493.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/nikerexaturedife.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/2334789307.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/molosizasajoraz.pdfIn PDF document text
    • https://europartner2.pl/uploads/buwunes.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/82104116024.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/xufaw.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/74299112246.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/51665214391.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/78a083c9094fdf5cb812f67487ad8f36/bozima.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091209234573499.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/muxajarufiripimalurid.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e032049dff687571504e01dc6506ecf8/29575049085.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/73240359127.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/61239580988.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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 17988 bytes
SHA-256: 52a5801333a7b1667c2e21238c834ec843265a61f1f26ccfd976b3b90574db0c
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10364 bytes
SHA-256: bb7c7e6380909b1a175a14f8fb3a00b84a1de0ca2f943017392299e5d4cb1b3f
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1