Malicious PDF — malware analysis report

Static analysis result for SHA-256 169a3d76c6861369…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 02:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4fa1e5978cb0f1ae183ea7aedd59b978 SHA-1: 82b518a0513386b6b61eeb247691d28e66654791 SHA-256: 169a3d76c6861369ea6e81a425e387e61e73caa055cae7c37c108d8b163957e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics points towards a tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=mononx+play+store PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a7b6a7ab---69714736535.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/77562298573.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/27662297206.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906175321581.pdfIn PDF document text
    • http://topstec.com/d/files/xipodukuvakumuvob.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/verosisepalopuk.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rewezasexuvimow.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///muvevuxexaz.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/41092678210.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e38721e0a---10431047871.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/47303293202.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/fenatifujigunupazoden.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/11194377113.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/86136943762.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusomifupujemesukepitisa.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/komibabizidexoli.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/fogemi.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/xodolomonipufeveler.pdfIn PDF document text
    • http://fourfoods.com/images/files/40077741969.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/jobusovajozidagifojubog.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/lipiwijig.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/redekafuligo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/129242b2a439ddc41e93af496a2e2421/zubopozalu.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zigojeduxulasuzer.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdeaab5d3---wevalasemijidevagopipidok.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/10555cdc2f8c8f832783573cbc63ab93/63061989781.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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 17916 bytes
SHA-256: 2bee0dd42c2d394e01b0f31fc811dc98ae6a2a612559166197cd9986fa365ab3
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10364 bytes
SHA-256: ed14995a8ede57e46417d9c7be343ded6f8e6fd680f1dd0ee9b844cf85bac3b3
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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