Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1fbe81f8d0e054…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 05:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4378da0456b50330113b3d61cfe9ab64 SHA-1: b28db06e3c9fbf7bc5d6df0e3fe56b4ef447ab7a SHA-256: 3b1fbe81f8d0e0540646be5ff550230191588ef5dcb456851ca4d0f26800360d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aiming to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=how+to+get+to+your+minecraft+folder+on+windows+10 PDF link annotation
    • https://bataretak.com/img/files/file/silidajiburajewugabe.pdfIn PDF document text
    • http://djpress.pl/Image/files/67635751764.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/39c45fb3d3216a458da7714058a6a1e9/punixosorij.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9da38580b---34066287077.pdfIn PDF document text
    • http://kasargod.net/uploads/file/93799733392.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80c47df23---vutaxutosoziso.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/rekimi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/ranud.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/nedapopuboko.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeduxexa.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/darutumejonawitagulemak.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/13004742975.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/ruxogixigenizojefatoso.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kapuwijikugo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/97292333393.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/65200649928.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sizilineritil.pdfIn PDF document text
    • https://kar360.com/resimler/files/21216894163.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jomilivolovanixodoz.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/mufevunojuwava.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a4b0ced1593921e916c3ec10c15934ca/gesepafalezekilijewu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2f0f54606fb9746d16b5504eb7b5a439/zaxoninunuwanedi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13e90384b---loburojedezowesek.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/327046241.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f361f0590b8---gavezowiti.pdfIn PDF document text
    • 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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 17532 bytes
SHA-256: 14a51fd4d1c07e08545f1943d7c124e0d1a667a2ba4b7d1ad7ce30b0d482d2eb
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 11284 bytes
SHA-256: 54c7c9a1a8bfa19a4f27f573d1c1ba3bbf3fbd79c3f0605cb6d5963fda9ebd84

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