Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1709c6217a2f24d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 16:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a26cf659d0be6f0d76e8c3ec3a7f4a2 SHA-1: f8b99c1b80423e0a16a331e797127b5dc998b3be SHA-256: b1709c6217a2f24d7fe7c24ec318dfd97b139c97ebdb2fc160691f31daf5c79f
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary URL, https://wastran.ru/uplcv?utm_term=railway+app+apk, suggests a lure related to a 'railway app apk'. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=railway+app+apk PDF link annotation
    • http://launensia.cz/ckfinder/userfiles/files/99538895576.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nibuvifo.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/nifiwikimuwewazelifame.pdfIn PDF document text
    • http://alkanboya.com/files/file///kawoso.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/425f02215a07e1cb5aae9732350b2436/14705476424.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3ab260e63c31a49e6ebf83ddf3a55612/xojesunitalimumebokoxujiw.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/35526187021.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/71518463004.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/96074081152.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a387b8be88---libimapozamelav.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/81142241770.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/32718548722.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/bojebokirom.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wusesizokamet.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/vurimofadimusutakemitali.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mefezexeteko.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da589a85---naruxo.pdfIn PDF document text
    • http://zeci.nl/im/image/luzuri.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/41699656855.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/xekigegukoxubovefanaxuti.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fe943fd9e---sesejadakakibiwerixad.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/57801167834.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/9100074750.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_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 9860 bytes
SHA-256: ddec8b1ac99195e9c6117fbead637b814ae312cf96bcef7602b154b8310feecf
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 17820 bytes
SHA-256: 156d148a1a20fe51dba732ab9f26bca3544dde1632ccbdb7a80ae7bc2945c77c

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