Malicious PDF — malware analysis report

Static analysis result for SHA-256 04821e50ac2c70d4…

MALICIOUS

PDF

70.4 KB Created: 2021-09-09 08:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20fe9e303e480281fda61850575c058b SHA-1: 2ee94bf73ed24404ea1a78819a5d83da3b0d3eda SHA-256: 04821e50ac2c70d4da59b1f63be4d8686ea7cb67796127625d25c353b9c7a541
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to other PDF files hosted on potentially compromised or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://1hozain.ru/files/userfiles/files/983853777.pdf In PDF document text
    • http://tuning-zone.eu/userfiles/file/35454876700.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/31227022110.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/37689398230.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4969463d---94832217573.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/2215926162.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/xoziwolutileteteladem.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/buxunexod.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4900402b28bdc06a139dff7d99892395/91792051304.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/7088388364.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/56901872359.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/74876881196.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/motavapinerivodap.pdfIn PDF document text
    • http://vejwun.cz/images/72119315260.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/72789870407.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912e2c0225---zogikililupuwuditi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1b313499---97822447929.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/10827921355.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wedojixariloridemopimir.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/45585666485.pdfIn PDF document text
    • https://cristalensi.com/public/File/gugamaj.pdfIn PDF document text
    • https://cape-electronics.com/media/file/xikurowosezovivezaki.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sidizuwugabovafaz.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/66219483415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=they+both+die+at+the+end+ebook+freePDF 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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 10548 bytes
SHA-256: 44ea96987169d6eb8bd4d324c64f391fb68680d6c45a22163ef6b0c20183133e
font_01_sfnt_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 16392 bytes
SHA-256: 3bd8b65ee20b67d767faf68606ed7a1f0c4da9a1287164c62a7d0ab95999cc21
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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