Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bdab9b3c6ce053…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 08:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f46369bbf1189abf293ce7ed31e0e59a SHA-1: 530264eca1aaba0b7c8d60a2f214508fc915a23a SHA-256: 12bdab9b3c6ce053a788752e23875aeb86b26c27d25c5fa3732cc29a4656511c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate it's part of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=best+games+for+ppsspp+download PDF link annotation
    • https://alwaysthesame.pt/site/upload/file/bizogijarup.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323969017a0---divekagivid.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/miwerapus.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/fapikumatu.pdfIn PDF document text
    • http://landpas.pl/upload/file/natimapijegiwem.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/84210450244.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/18666886573.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff8e3a21f---67027686138.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/xewefamiritepitot.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bojipigite.pdfIn PDF document text
    • http://inica.org/files/file///nuvomolezaziwu.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kabifefatibowutajini.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/26103368188.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332a17eb06---zabepet.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/364283029.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/nuzuze.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/15236818153.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hmjq9dlf75ehl71hv2i5n0u1f4/nololisizozan.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/nibedosuput.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/bewevegebajunuruvupavoz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090119111956.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/nanemelategelanapabax.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/76723380639.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138923f91395---97355594782.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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 10888 bytes
SHA-256: 2e771407d2c1827599eef096205b1309bb9c872c982d5eea55966132ac473322
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 18060 bytes
SHA-256: 3805e2d21cef875bfe47e3a091557af542d0fae4c7eaced4c126acd0225972ab

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