Malicious PDF — malware analysis report

Static analysis result for SHA-256 991948c58eb4a8ea…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 02:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ec2e0f751c0500f20aea85245b07077 SHA-1: b9e3024796e305cfeaf6773feb482fa122d37240 SHA-256: 991948c58eb4a8ea595365d1bef0722ced13e31b8dfe16964098fc821b4f9f36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://rozynoklinika.lt/userfiles/file/53152667985.pdf In PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/muzemuvawolurufagokonuro.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197184635928.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/21193318371.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/32671699442.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/supetifemi.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/kibedose.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/dozewufeletudigijudupipif.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/iio0hgvhkdgaod2di8dimvsui3/budetugabi.pdfIn PDF document text
    • http://snft.ro/media/file/kawilirubol.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/nutujetijojisobipuru.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/74409335066.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/57363832346.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/38477143132.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/84817901944.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bbc6b1a1---12161200135.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783b147ed5---lepapugodilamisinonoloniv.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/vawawurezi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/pemuzejozolar.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/foxafes.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/18637532110.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/81496910359.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74280352445.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f947ce4030---59509005355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bouncemasters+hack+downloadPDF 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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 10876 bytes
SHA-256: 3e49fe809d82cbb37c352b881fab71c980c52174db16271aa3184d407dbb52d4
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 17524 bytes
SHA-256: 1409466a82dde58e1eea1742cf7a94aa8922fc041527a362855d7e780448f25d

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