Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb60fb6c3a66747…

MALICIOUS

PDF

106.1 KB Created: 2021-09-15 12:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 389d8d6fa8e494d90ef110790664c193 SHA-1: 3657e0638f8cdfa7895bb327e974913024976647 SHA-256: 0bb60fb6c3a66747930fcd6d47e542b63b76421afee670de995ce11dc336e7fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to phishing or malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=harmony+os+virtual+machine PDF link annotation
    • https://sheenabusesandcoaches.com/userfiles/file/sibuzamon.pdfIn PDF document text
    • http://wajl.net/img/file/202198225448.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/68008254712.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/vevinizoxajifujif.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/pisizelo.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/zudebawirenoridib.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/198afd8eb7c9ee58872051b1ec3c7073/96308477487.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4669f772---noluvizegizo.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/potisimanojef.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vopaxosodotejake.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/18260609827.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cefd745cf---95421477663.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/virutuliwobiraxadofoz.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/82143034281.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/siwubuxedasenalineze.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/46410602550.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gam8ltvuo1mgdr03gsc8h24sv7/dujarixewafaw.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/19bb18cb915cbc8c0c0a914c3dd90e69/24360409078.pdfIn PDF document text
    • http://kunbot.com/upload/files/15581549598.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sezujawobomit.pdfIn PDF document text
    • http://hkacca.com/userfiles/xozon.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/mekebuwaja.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161411ef586f61---nuzikavaz.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_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 19228 bytes
SHA-256: 105d8cc8c204886b2e42b9c20ded365dc4cf219dbcfe5500e32324307d97cf5c
font_01_sfnt_off00016a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A72 10768 bytes
SHA-256: 3906a57a2c51f6ca658cb79e920cb2f04eee2d7f3938c8b9bab5a74fcb51a5ee
font_02_sfnt_off0001830f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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