Malicious PDF — malware analysis report

Static analysis result for SHA-256 1682c2219519cd12…

MALICIOUS

PDF

108.1 KB Created: 2021-09-04 04:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 522d7a6dfbb7524a47c24fcc8920f8c7 SHA-1: b5eb0293aecf130dea6eac563ef3f295347f4265 SHA-256: 1682c2219519cd12e63c7a5f39f1ee0ac7b4645fcc64e5a8544514842bbf41f2
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 to websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1fec973f332aed01c62e3b7ba55a921a/tujodixesan.pdf In PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xigitugunud.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/mogijovumiratego.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/degoxo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9128db241---pekuvuzaposinap.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/82704407024.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/xakerujurawizobejunero.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/somujarumutus.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/60759621393.pdfIn PDF document text
    • https://eslms.com/userfiles/file/buxoxufidilezumizamigu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/xigexevir.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6bf098e8---48274575328.pdfIn PDF document text
    • https://purefeeling8.com/data/file/zetadosojaneririzaj.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/82084774237.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160803e68a2cc5---goxirebu.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/92824602899.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r5mm81r0jvm6fg2et5ku2p35hl/zogekogivakura.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/82230850549.pdfIn PDF document text
    • http://hrudolf.com/userfiles/85773956868.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/79101216486.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b2b15bb99---47353958239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dell+server+r710+manualPDF 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_off00013ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA9 19792 bytes
SHA-256: dd5ecd33808b434fe725466bdd210a347ba788af8d273a68d721e74d626cd2a4
font_01_sfnt_off00017284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17284 10348 bytes
SHA-256: 2c599d22d1332960a0dd1f8b3dc305e1c0e3532b901fa41836790ab12c3b3249
font_02_sfnt_off00018a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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