Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd3f516f8f11fc4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 20:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 690caa30070de5a20875a318983870b7 SHA-1: 63615cde7c45b0f2de537bc3b1ecda4efb8cdb79 SHA-256: 1bd3f516f8f11fc44dcb274f89f88fe73ccecb63ce4ecf5317e7b481df811dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://museuminiaturesbesalu.com/files/53398902148.pdf In PDF document text
    • http://worshipedia.mobi/sites/default/files/file/47839246291.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/volisadoluxovijixugeb.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/voniwuran.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/064c8672e3160c203c755d936ed1d0e7/72144358985.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/78280764356.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/18926800461.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3badd2824---gudozabemimowupijuvoti.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/5761097451.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/gareda.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/39880774624.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4551cb51---53079230313.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/11596859307.pdfIn PDF document text
    • http://schokofontaenen.de/idata/navokawe.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/97556809303.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210903090826.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/38430033776.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/43560441885.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/jojugujawufurazibunoniket.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/eb3b11421bbc9621cc82c2387e7e7759/kepebogodexenedefanedoxup.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/73378440014.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/53422839112.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/sevawenagujutotevutem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hack+traffic+racer+apkPDF 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_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 10120 bytes
SHA-256: ef56f9ef6d8aa05d683a4259956b5a22b17293eda1ad8f1cc06f6fa2fb14fb64
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 16788 bytes
SHA-256: 5f49d50ff7dad165846ca111d6d69c810c0d308f0e019561d3f4fd79d2d4d1fc
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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