Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee128a2f1461e1d…

MALICIOUS

PDF

80.9 KB Created: 2021-10-15 06:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6be00098f360d1fc6eb66e724a218e2d SHA-1: 54565cddf1fa4cd840aba336bbe85cb2424e4d72 SHA-256: aee128a2f1461e1d4798c5cdc769baca8771a902ea8c2d65b8c9c3a5e213f26f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users via these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=how+do+you+make+dark+brown+paint PDF link annotation
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452ac26be0b---40891491721.pdfIn PDF document text
    • http://vladekoservis.ru/files/7029082526.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/84ed7f578fdda5564c725e64302b22d8/nodefafurodubegap.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/popofafid.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615de122dfa0c---51030392720.pdfIn PDF document text
    • http://infosierra.es/images/editor/mumejibepexat.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/87138134022.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/wawilodef.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/doxowixozemenoxapena.pdfIn PDF document text
    • https://arerp.kr/data/file///81706722033.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33383703971.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/4739352479.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/38707974268.pdfIn PDF document text
    • https://dasyueshan.org/userfiles/file/88642435276.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/jetajimamonito.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/10919126673.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137b45d2ebee---kevovemexonipofomatuguzot.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/29945560928.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8019199f8c95b3e8de5eb76155cd1d7/timubanunubazebamefefapum.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/66037217608.pdfIn PDF document text
    • https://pt-lb1.pasarantogel.com/contents/files/70239436149.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/pujivujelopunuroren.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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16480 bytes
SHA-256: 66f3c4daa2d28c390ae9d0c618bb884aae0e80856a860beef1b74e9f9d2fa05a
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 10864 bytes
SHA-256: ed02a0db89125faa53f274d0f56cf8b64b707f101ca116c9a1991a71bd3b4f1c

Open this report in the interactive analyzer, or submit your own file for analysis.