Malicious PDF — malware analysis report

Static analysis result for SHA-256 457d95c0216c90ea…

MALICIOUS

PDF

91.5 KB Created: 2021-07-06 09:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba3faae300cdca898cc425186f40e2ec SHA-1: bfcc040510e5209b7e094e3c4addf9a3af3c37f2 SHA-256: 457d95c0216c90ea8b7411abf8676777e8bdfbad6a0d196adc13f6631bdf793d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm nature align with techniques used for initial access via spearphishing attachments and directing users to malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://rajakedua.com/contents//files/rusubo.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/198d86bc087bbfdf47db5a74df73d2b4/58379793754.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c90f3d285---fujereloxujexupigosoge.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729b85a7e0e---58009504288.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2dcfc5e3377cc807c617768190602157/juxunilipotip.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/71142979907.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1l00nbqsq8glrlj3r76vd68op/joxifofafitipejek.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/389e1c71d88a5b5aecc77ca65edaa162/luxeluvevidenulo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089e8a8e860f---17581753685.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/komumutoxagegapivepe.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/77412221812.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/s9a9me0e69da0s8494et59e07n/kijupujuxufakefufa.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ohst1a1sp6iahrmv9u6h3gns4m/rabolajosonapokezuv.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3be7425010---44731450970.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/25126a14e88dcaaf32c5329ec43becae/vukesevusure.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wexoduzore.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/3suu0ninjb6vv05j1kapfkuidp/75668608660.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/arnn8kse3ru672nd5jr2mj52a8/nasatixugivozufuwipewo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa3a121d48468f71298d550b3ac16e29/sosezosaxirafap.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/jufukojobitepoverubus.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cc26b8a5---57804969715.pdfIn PDF document text
    • http://candientushinko.com/images/file/3036435492.pdfIn PDF document text
    • https://termoformat.md/img/files/62708353185.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/de4fd3811fdfef6a9ca10727161f1d10/mulutisa.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/jibolunafekimuxirutugis.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pujenadafilorof.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c45f66c5197c3cdad661e194c67dc3f8/winozojejorib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=future+gaming+groupPDF 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_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10460 bytes
SHA-256: 2238704647101686011b2fb6a1d1b8f3d7fca610fcd9f42e7f1792b957cc3363
font_01_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 17512 bytes
SHA-256: e2cdf9d21e6a662bafbb64af1d52555ce0dead770b2c69d76f6aefb70bfcf16b