Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d16c14f871be635…

MALICIOUS

PDF

93.7 KB Created: 2021-09-03 02:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 231490c8c99d0282e4c4ffe389a76cea SHA-1: 9c563dbb81152b43d52ee7f43b344f20809918d5 SHA-256: 0d16c14f871be6356e35da9f152b8c8c902f6e5e86e98ec1c35f16538205b8e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to potentially malicious or compromised sites, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/mn76kf7c66mpinibquie91aba9/76956550185.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/38032e9185e0e8c9fadcf5e993c8ffd7/potobima.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/70269666259.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/zepixigijifiz.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/35030538913.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121dfefadb77---zijisixaxoninit.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/14715599003.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/mibilija.pdfIn PDF document text
    • http://geose.ru/userfiles/file/xetokan.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/75598970264.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/95410333482.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d519ca3bd1---nevozegasixalutifikaruko.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5169c5d5705ccd57a743e969f4ba0542/88600874918.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07dd010eab---gerogelabogogifuvisel.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/533c827b99d7323ea036a4d78683751e/nebadudaxunuwopelalej.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vawigazifisusixabimoxidu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/30517420361.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/26246994086.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/vijupekodapepadepopol.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ltsc8oju17qus2f30j256vlai5/38403388393.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef61003dae---kazitubupetogojexu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4122b361f3---muxisunimoz.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/vebosal.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/457617640.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34fc38c5fd---kapinagoroto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=democracy+and+national+development+pdfPDF 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_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 18520 bytes
SHA-256: 766b7610e942e0138fa9bb6651ad9e1a82620d178958bab0f73ffd90ac40d654
font_02_sfnt_off00014feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEB 10796 bytes
SHA-256: b583f6fd7f64ba04be166addbc70e28fd05e3b03d3470afd201b2e7dafc1e365

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