Malicious PDF — malware analysis report

Static analysis result for SHA-256 3727e2fdb07490b7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 01:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e56a34a0cf86b82407f75b2b6f5088b SHA-1: d156aac72ae848564fdd87b35a692d1b14d5012e SHA-256: 3727e2fdb07490b7c0af04143559db8f44d8835661bb0458c0cb8b995bd3e770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=sex+image+editor+apk PDF link annotation
    • https://dveropolis.ru/upload_picture/49737166278.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/mepukajiko.pdfIn PDF document text
    • http://klpa.net/userData/board/file/22858391380.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140035d04c7a---mozewisilesosigen.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/kuluxozekefasalanexosa.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/gupezexezesivepulamojaju.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-20/20210920065033904485.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/71697629817.pdfIn PDF document text
    • https://reniuved.it/file/17253220818.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141117a3e2fe---mivasojizis.pdfIn PDF document text
    • http://logicamail.it/draft/media/jimijutux.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/bovolorasexomilejadapirom.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137105c61cfc---67350230828.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161467c41d33ab---49934161176.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/71976780687.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137df4073935---49001810884.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/radazarusulimug.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/55346677905.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/91196657543.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/17033089099.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/ropukinujut.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/80654825487.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/dosunazamorominiguvoxi.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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10684 bytes
SHA-256: 8924b4f517f9e2b5e343864991bb2effcd242ec07401972b36a22461421e184c
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 20472 bytes
SHA-256: 24cb45609de4517bf1067f4e4320492314bbe457b0b9acfc061b651ebf2f6135

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