Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53251e3f8894cf7…

MALICIOUS

PDF

99.8 KB Created: 2021-09-07 02:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76a57b03053cb5af7a193a7ae30eeeda SHA-1: 34dff8b00ffabf0c7a13317864a600c760317222 SHA-256: c53251e3f8894cf74cdde53282b72cc1691e5fb88b20d4cf2aaa0bb33edca19c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://majorsagilekvaros.hu/uploads/file/bavupuzadoredozekog.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/aa958c1f7cc4de927388e4793567f662/sobog.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/d22u6tlqe5umtjdili76d7jdm0/somudazilasopatu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160830dc193303---rusega.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/riwefopubibezugatonib.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/viseje.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070a35fb5ddd---63473293281.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xawaboleregabixes.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/84633749977.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a7c198a5504fbec8636ebbed37d978ff/69988417366.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/32646784902.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wazefivod.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df8f3bfa6---50447139504.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/kolat.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/fowofi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/38802708163.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2759b968230718147a42d914c0c5de2f/16749385111.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/safiweme.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/jalawaroxu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gumusolugomodovofipo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/54028306517.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d7e7761238e0dbebcaa3247054a4a537/84903108074.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10680453754.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1dc58947ea93ee961b34f370d1ed1090/31152150990.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb22d1455c0---dixukasojogesuwexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=was+were+worksheets+elementary+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_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 10956 bytes
SHA-256: a9924372d8cf668511237d66d418015f97c01a6551b831cc6be72ba28e7ddd5e
font_02_sfnt_off0001555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555E 16932 bytes
SHA-256: 1d4219daed41b42a4401d429f79766515e0dbdf0a9d880246ac020fa2b54f36a

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