Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4beced6e23d4767…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 13:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 570fbf7a159dd0d96ca9a50229801fc7 SHA-1: e21a9a78a183af5a5702cfce756579307ae947f0 SHA-256: d4beced6e23d47671fa84fe83fc105f719343e78690ab10be4ff011999bf7358
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9892fcb778d879e53982950d4cb3f3dd/55381350443.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dd480509cf38afad1e4837b9519377b7/pokawukakilosoripibodese.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/fosesatogoroxufinosu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42002767149.pdfIn PDF document text
    • http://grupophi.es/uploads/files/50452182435.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/258287220.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/31512804716.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tobezazekabinekelorise.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/70697242696.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/57694778676.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/769019169.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/sadapijidukikadaboret.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/besifokobakarenotoleku.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/pewidulowumopitafem.pdfIn PDF document text
    • http://edituj.cz/res/file/62059274779.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/96622f7fdf0edcb3ce97a61653a31c61/lonarekigobuv.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/dulofoga.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/15219627040.pdfIn PDF document text
    • http://sicurezzaips.it/uploads/file/8214917428.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/49155675610.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210919212207_s3z5e6.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/27130757517.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/vigajegabora.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/zuzef.pdfIn PDF document text
    • https://aneri12.cz/res/file/2842495726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=city+skyline+apkPDF 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_off0000b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 10260 bytes
SHA-256: 298da8e4802d1ac892a7dbf65476785c3ca440866de2acf7c9053fb3fbf23d08
font_02_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 17568 bytes
SHA-256: 7cd58ca0c543c8ec31619be4554b57b52d83004e456d891858414cf412877da2

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