Malicious PDF — malware analysis report

Static analysis result for SHA-256 375dabe038957b5d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 05:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0f900c8c384ee82947b4c74e38bc081 SHA-1: 5c0e24b17d9ce821618e8c6e6b4789d1695d41b9 SHA-256: 375dabe038957b5d62cdd70c40571454edd65aa56d006e027356b46c49f15948
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The presence of numerous unknown URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hiperaktivite.info/userfiles/files/dezuwokow.pdf In PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/jodexarepe.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313feb3e481---43280123928.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/72314324467.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/17547220645.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2eca3115---vavudogiwa.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/96034166472.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zetexuvanazipumafuwuw.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/56bf8e5a3e0b6934d30d8dabe1d6fe82/47605066602.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/segagejebedojiko.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/59109764774.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/rarabokixokisopo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/tegorerimute.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/devojagaxexadolewegozad.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8b85f6e330a1e35bd716cf2afbc21e07/13409478735.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/48808250595.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/fikamazoxo.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/dilosudowususiwutoro.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wipel.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a3c3cb7---kuxovak.pdfIn PDF document text
    • http://thongthien.vn/upload/files/77690323402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sms+blast+apk+modPDF 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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 18572 bytes
SHA-256: 83944fefa3752bc53c3cd48aa8935c634a701894a5351d7531ee23fdfce93c87
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10432 bytes
SHA-256: a7cbcb2ea3a43c41a5bb5839a7c16206f2f2b38c8bb18feb10c4dbe1c6af96d7