Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ae7e25b217c571…

MALICIOUS

PDF

80.3 KB Created: 2021-07-04 15:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50138b8e1aa37a63448d9dff442572eb SHA-1: 3f56805a5d81f6ad3da8b59354e17d48f04cc5e6 SHA-256: 48ae7e25b217c57140eaa43cd34ebafb90abd51ba3af512d263e50d0415c659c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content. The PDF itself does not contain readable text, but the heuristic findings strongly indicate a malicious intent focused on URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c3fb7e4a166c0ff0710954d3e257509c/suwolixofifazo.pdf In PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/23702103242.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ak01tdrrh8rl7o757stj947vdp/lawelikirinare.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ca29803c---jofelewufewoje.pdfIn PDF document text
    • https://hojoairport.com/images/file/75157004664.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/koxiwirojukezakakireva.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44fde10c3---godimaribizanuteno.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50b045d9d---29350299106.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9u77oj2j0ss6u73pqhj2dft6f5/18281609585.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/76f1cc8c6f0775134d7fa79bc1d5a4f6/zulegexorefizenuvenamiso.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b7aa6feda026fe98a8cbde6c4b8fd59a/41553987995.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bajefubomedajolazipare.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/22768231933.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/96173054206.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/debunerumepazosubumaxivos.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/55163999359.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75qgpshcggkjvhk84guvk54n65/putisobepofugeve.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/ziranu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609069a525aec---norigibegivew.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/84006304982.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/dutopimazibevumo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65edb1de932a3c3d9b31aac0d92d31f7/sufofaxevuweze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=atomic+packing+factor+isPDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 17492 bytes
SHA-256: 1826bb106eb1195bd2ad95a1e1d67d90f44a43a295ea57eff79adbc1d9674662
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10720 bytes
SHA-256: 7493182fa2a795cbe7164f641277eef81ac86d962d58211adef81c2aabcaf830

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