Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac6fdb385099363…

MALICIOUS

PDF

71.8 KB Created: 2021-09-14 13:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86081caa5b89a784ed6370594bd1996e SHA-1: 23778d09f1b4adac12a2386471ebd44c5d858557 SHA-256: 1ac6fdb385099363bfb218f9b186a37da2c5e23f3abd4c0599760f2fdd1fe2bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics strongly suggest a redirection scheme to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/95558197626.pdf In PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/lolunasitibenoxumipises.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/68239300411.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/16790244246.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/lolejagud.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/75442979630.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/48695828.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bomanabof.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/32147553206.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/dowagevemamobunaruj.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/bowivuxujuwefevesojib.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dafd205c---77815354753.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pknb1strlcfu974qakkiqev840/80877676084.pdfIn PDF document text
    • http://surausa.com/uploads/files/52673382829.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363d02e1776---ruxowarolebe.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/82487657303.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/59066327190.pdfIn PDF document text
    • http://only-svet.ru/upload/files/9415687570.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/batixixuz.pdfIn PDF document text
    • http://metapolar.hu/tmp/bexije.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/16296834733.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/tosiribenetajil.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/wumazuporomaju.pdfIn PDF document text
    • http://marketingnews.fr/images/file/24541234613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=miley+cyrus+twerk+gifPDF 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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 10512 bytes
SHA-256: 5174c283111271f8f12ec0b14418798c552995d3425649992510bc4abba1f981
font_01_sfnt_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 16148 bytes
SHA-256: 83743d06043c695f179eeeaf99a25a9c5058efa3459c475c9e9e3d84fb73aa6a
font_02_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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