Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77393eec378f9ae…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 05:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59329d252164c2a74788700cf3cdde4f SHA-1: c876eb7914e3c78b2c12a020c525008e63cd8883 SHA-256: f77393eec378f9aedb08fe3454540db01ae4788fbb355732b97aa2e78e074629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to compromised WordPress upload storage. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=naruto+mobile+legends+senki PDF link annotation
    • http://www.gamylai.vn/uploads/files/denusugo.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/61198935850.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136baaa73b9b---84160100594.pdfIn PDF document text
    • http://topflexsports.com/uploads/15050821180.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/67996412124.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rujolizoxabakewopil.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/45160129424.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/pajapajevuluxulesegi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929f5833a5---tituruk.pdfIn PDF document text
    • http://caythuocnam.org/images/files/lerov.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/3864327346.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/18506311754.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/48c8fa5aa333a14dee4d2ce7b416e38f/34371557605.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/35973516487.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/wevoz.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909033250443220.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/tuwonuxudivasuziripulafi.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/49136181331.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/beliduzepoxoginusamawupor.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/74140394321.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/91824964771.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/27684535391.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/dabopafefu.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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 10900 bytes
SHA-256: 34c56cdd4c5bbc3ab02bffc54713375e07f55bee306475312741a2fc61fd295d
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 20268 bytes
SHA-256: 8630dab434f8cceb58f4eb91c205adcf0db7db625cf3c95d56a86ed00588cbf2
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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