Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d93bad6ba4d6d…

MALICIOUS

PDF

79.4 KB Created: 2021-08-31 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 253602a9fe1f08fa40681d9a9ca031ae SHA-1: 99c92d183c49faec53c988cb5ab074e14ab7a16c SHA-256: 1a5d93bad6ba4d6dfa3d6fd9c4f6910ca1bac75dc76d5e4a3f60c7b1f9eb6cdb
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://apsco.ly/userfiles/files/55207119387.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d84874014001ec7b9416464016895fe6/50350709231.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4e63aa0b---nusinazitonusepakeveri.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/wavovikazewimatejoli.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/saxowifapanovajukipilowux.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b281529---47498279440.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19728565423.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/45947783575.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e44b1a4a---32706864463.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/mudejukalagadel.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/36447143489.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607611559d177---momewasopololezorilok.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jogipagajeradas.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/508b7740d452555b4a4357292f551ed6/87235592829.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3667563e84---jediwake.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56dd3e8bf---81924537145.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/wabokixipaneviz.pdfIn PDF document text
    • https://mauspro.net/upload/files/49394467891.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/25200211905.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/67571009400.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/vejexagid.pdfIn PDF document text
    • http://ud2-140.com/files/xogedagag.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b33bc10a5b4---rogibasobakuxegelo.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/sezuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=filmora+9+offline+activation+email+and+codePDF 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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 20360 bytes
SHA-256: 9f3d254a202b8aef69416d432b56a26d6cf68284b806c8d05790ace6907e14b4
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 10680 bytes
SHA-256: 45475875b5198adb1c7b9c073981cb00b28e624efc323c031469d0c0e94e2cd4

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