Malicious PDF — malware analysis report

Static analysis result for SHA-256 151dfc8e81eead5c…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2755eb73341c8496dafe68c29a53ea87 SHA-1: f2bddc17e66044c5e59912aa9550e3fbb73bcc7b SHA-256: 151dfc8e81eead5c4221141d264cfba0394803d8abb529b327ad583cfc4146f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous provided URLs, which are presented as search results for academic books to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=bsc+1st+year+computer+science+book+pdf+download PDF link annotation
    • https://festacontinua.it/public/file/kifoxuroleg.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/jexoruvewimag.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79cb3e4e5---nuwiralavidolupubarojipir.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6109aa42a87ed37ae23a906e4c188548/45923417923.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/77861568684.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/bugisutodudisoribev.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/30a0eee90ca698a137917cf9d1a755aa/lusat.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bb79ae3deaf8e4edf1823f3a50152a35/42305729262.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/rolado.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/005536ae84e52f293eaa8677d26e0e66/jopijitiranapewivup.pdfIn PDF document text
    • http://mrybalko.ru/files/49199344363.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/75251348448.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/zovavibuxer.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdcf7aa70---75130696679.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9975c93c048a08bf848e2d91e9717454/zatunodigegadikifolenoso.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083283c46849---bipomevebalixeba.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/womaparolawodigedefodojed.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e0685596---37695576269.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nepewixabaz.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1a099d94cd58aa214a507da17f0b985a/rawukuz.pdfIn PDF document text
    • https://latework.cz/soubory/79904661001.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jdsvna8up690u9rriet6u0fad5/pisaxulusobogenizugamuw.pdfIn PDF document text
    • https://afayl.com/userfiles/file/fejunik.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/zapesamakagegovovekoti.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 17056 bytes
SHA-256: 49a2fcc7bdb4f5f63b307a469ed451c4d201d3fdd5952d8114183aa4f23e8cee
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 11416 bytes
SHA-256: f87976a84c69224db804ba4d8a0df2f3459d6c72568712b2554a8ec342a0d987
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.