Malicious PDF — malware analysis report

Static analysis result for SHA-256 5202f76db1c8fa9c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 22:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 54f848a3f700d26525303a2d0c86655b SHA-1: fd7a399b3dd2b643f0b7523f82b18df2fe620c68 SHA-256: 5202f76db1c8fa9c31f09de75ba6cb6f89649ffd5e6be6ffa8ca3e0e2a0315ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/libumuj.pdf In PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/51354880373.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab197d83d---58489156338.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/vutatuwuviriravewobewer.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/rijomesuwupobubuno.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d66d28261---najeroxovusav.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bcue971k80o4duvv04km0l9hi6/28691524756.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/paxetobufal.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4524ec7b2---zujesuwa.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/kejibipesixuforur.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/36012382245.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502155340.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sosat.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/91003759180.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/2604271904.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/nidatudofeluvelob.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/pesik.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/20566097595.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/88497227978.pdfIn PDF document text
    • http://jar-ted.pl/file/kaguraluzabizoxafotaju.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/morivetagewuloza.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/1644575451.pdfIn PDF document text
    • http://imi.vc/upload/files/gijid.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/42703271086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pediatri+tus+sorular%C4%B1+pdfPDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10536 bytes
SHA-256: 59c1c40a715bf142f7b1d22b9dd29bc2079d038697b78a827ef58d4a2a79a1f4
font_02_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 18836 bytes
SHA-256: 3984eb325cbc1eb2266d34d1862abe2271c93fa8fad7e7554fb23473133362bb