Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a0a717ea1851ed…

MALICIOUS

PDF

89.8 KB Created: 2021-07-24 09:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ab066695e36c61b11f763e1e3207232 SHA-1: 4448f2af28037c73c4602d5cffb0f0c236310525 SHA-256: 18a0a717ea1851ed0a6cf15c56bc6c4572f998c03602b7e55f115cc877f082a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malware or phishing content. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160965ddbde2b2---xozopuxa.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/24cb6a055999b3031a53bf4af17c9d1d/kagozajisoxajupafipe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607703342fbf4---lebuxawipufuweju.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/vuwofafi.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/40680741782.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/66591802779.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/25274517694.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e51410196555a0161fd4715b4e311af0/67192138289.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/70269403068.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e4c6a3c8ecfb074aee6dedda7fc8e841/77669088494.pdfIn PDF document text
    • https://tl-systems.hu/files/files/zejipexe.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/gamebosipadukosujegatanax.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a9513dffb---gevusofusolapufa.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/ritomigegajodadiwojali.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/74229941311.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06bb684b8---90577208814.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/18v5qqblg1djga8og8t5g0rq96/zuluwozowebowaxara.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0e7cd6b9f52f13c09f9cfe4095fad621/24246802433.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2e7e1f97a612b9b49c8519af5a8b66c1/tibisuruf.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec23b02221---60455240322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+turn+up+7.3+idi+injection+pumpPDF 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_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 16272 bytes
SHA-256: a3690116e88e3b87d27fa9e84f74cf493ee8dea0a4f62efdfac1a51b101476b9
font_01_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 10892 bytes
SHA-256: 33dc5e328c9c27eaa95ff385f82524fab9faad6328f20aa2c09bd23e8c436f9c

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