Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cd340478f377e0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 23:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69bc5513d52af832908f2651573be8df SHA-1: 04c6bd31f25b861c423364bc4e312fb7f1c85f3b SHA-256: 20cd340478f377e0802d610c994279cecc1217f53d83418840825c8b8cc00221
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1m5nopo020cunut996lj35m251/24445865390.pdf In PDF document text
    • https://pestresolution.pt/site/upload/file/98555744232.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40aa5893d---dajinadurosivusazuroka.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kijodigopalone.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xivuped.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/bodabazorepisevifuli.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/jukasijazenisabe.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tozuw.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/69939778743.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/zofimivaxaro.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7k542r4eej61354chn016ao31i/77504936898.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/lubejemajafimazos.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a676081620a---detimofilijofubafifumipim.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/cd43ae82fcbebda11543cb2179ced0bf/38241952759.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/670c94201d212237896b36331eba366e/nezasisurutowa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4b981fa3---lojetitu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/aba41f574d73c292c86a763d18ef6414/27290278907.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/takirupefu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1c65d8df3857cbc80131db4f5a4e60e2/74897742732.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4289223e9c9c1f7e0b57c49a080dc866/fobojudewedes.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/1786634355.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/tolivojan.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/jinixewo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zasavuxadurawap.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/mokodamakebipe.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/nimaxunoxobogemuninaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=privacy+act+nz+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_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 10388 bytes
SHA-256: 4173bc5d5fd4900188d757e96ec5b325a32720c4205c19b6483452b2798347ae
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 17992 bytes
SHA-256: c50885eaf5a59bffe02e28c2134fba174bff05bdaec51e5ff6a9d8fc25429ced

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