Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4f33a853291f52…

MALICIOUS

PDF

64.0 KB Created: 2021-09-25 10:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 54ceba1df1ca180fd51a6ade011c3caa SHA-1: 6bb4596e029b9f39b8c447267b7d50f0e2c55d3c SHA-256: 4c4f33a853291f52d0ffec5a33d0779a378cbc8118a2bfc2bbb81c0561de7fb5
124 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • 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
  • 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://polins.org/public/userfiles/file/zapuri.pdf In PDF document text
    • http://vhktn.at/images/content/files/48900391387.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/27596787066.pdfIn PDF document text
    • https://linardi.ru/files/file/fepazusasipet.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/62661375281.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/bojuxufojolo.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/39699159981.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b3518c18---40952456751.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/voranifawowara.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/negafiwurekozuvuxuvefisen.pdfIn PDF document text
    • http://glassick.com/userfiles/file/notetem.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/nokikifinepuxidixu.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/xagen.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f09ef8fd329fa35b933ba9dc35122590/sowujunetejemi.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/46441318297.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/zofasogelixexikitejof.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/vagixixisozire.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/xafumabirufotekutoxa.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210904_180412.pdfIn PDF document text
    • https://arendic.cl/files/govunulalux.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/5159812623.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142752b441fd---guzamujevixowawavanojit.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/jatijalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+mp3+mp4+music+downloads+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D3 11084 bytes
SHA-256: 0e00607f3836cd57b86b9b5d92f6edea0bb06a75f7ff24dc131155e476cdcc8d
font_01_sfnt_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 14492 bytes
SHA-256: 206512930f4bececab1fc13358f6af8dac78d383b232583f31601ef9a8b7b5a4

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