Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56b642fb2f4802c…

MALICIOUS

PDF

96.6 KB Created: 2021-09-12 13:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5a3351e136481dab0f0b75ebe65856ad SHA-1: 7e2f69cd5e6c6f10f56327e77da892315fcb7019 SHA-256: a56b642fb2f4802ccb7875060faf663cfff5165502cc9bec858b28800cc7bcfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=machine+learning+systems+pdf PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d437be6d6c---11245026182.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316344c373b---werizow.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/47947239749.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/22382274404.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613237ee4e074---44553950150.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d0195ffa01f47d7ffdb2190b6c0cf27a/12726262985.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jinipu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/37814437455.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/624332131833e8e44c06681647b780a5/tewemimovukavalojavajav.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/39178616158.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/rejaxurafu.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/50283857935.pdfIn PDF document text
    • http://feg.vn/uploads/files/50741666906.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc49ecd951---71500827487.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/sadinokobotidarega.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/jimomapufag.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xebupalirejozituxufu.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/pikupatapabaferen.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/totarana.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gavuwotimejiwanis.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/94752242080.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b463238de---52132894681.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/68571301705.pdfIn PDF document text
    • http://beta-rc.com/upload/files/53129887211.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_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 17924 bytes
SHA-256: 844739efb78c781537a18b8034e9e1bd72de6b00cb8b04d15eb9fb536ce58496
font_02_sfnt_off00015b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B74 11052 bytes
SHA-256: 5b82d81c2d64866f66def6264a26638792738c12122092683bb8b5d3037f2f60

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