Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2dbce5681d66ae…

MALICIOUS

PDF

89.9 KB Created: 2021-07-21 03:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af9b5b51fad777f4898474a44b875364 SHA-1: ef4ec8a102050297d34068b5ba1618222e0847a9 SHA-256: 3a2dbce5681d66ae4cefed956fb7aaee4b9b9bbe8af91acbc21efa0466404b1c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. The PDF also contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vivaldiroberto.com/img/files/mediafiles/file/siralin.pdf In PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/7387723102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cefb4c0986---zifutowarufu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/95667388913.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/72329169389.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd02fc3d5b---kepawijafenaso.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ac4317b07e611f8dbd629d7d2a357cff/48822707395.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/22b8a600af1acb78502ea597a142ad53/tixirunomenemoguxejowami.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/78266293558.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dc11b6f64065833f015a97e6796d4cb2/dagukubopifapatep.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pbhpra8jpbi7jnqseaarvv2sm5/vesodasadejavipafin.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce45d8ad63---2434639354.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/32563727443.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4e122518be27aa35632141c859675966/tivozezotu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad13ddc3a---93947087228.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/lulumezawibomobovujakefo.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/sopibojajefojiwubokotumus.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xoditari.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7b6439b79ec8b7cfcdaf19ec42ba8d63/kevufatovokigewe.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/74917673642.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/gogabebomosapexaxamaxo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458919cf11---nisoperesagawedizudur.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d0cd74bdc885a93ab003f2f22264791f/wiganezigu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad16671425c---75169228347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+writing+skills+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_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 17452 bytes
SHA-256: 4ca4949590591bca0f0bd0dda8541a7e54c8a2d84ecf8856fd323d1acb73d97f
font_01_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 10732 bytes
SHA-256: b03e9a2e20e5a6f61bf7dfcbb0657545bd9141af55b539196b329b79f1a43a4f
font_02_sfnt_off00014089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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