Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b683bc053f26d16…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 06:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46fd2e2e737dd8128c81b6322ea5a4a5 SHA-1: 7e61e5cdb7eebe1578996da82bec36a14bb46d34 SHA-256: 5b683bc053f26d16c7de0eb205f3f968cda1ce996c5868e6bdb34b00269a09fb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to websites hosted on compromised Content Management Systems (CMS). This behavior is indicative of a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4fkrmuqucdhg7qc92kjj4682is/30114969096.pdf In PDF document text
    • https://gea99.com/ckfinder/userfiles/files/linerofebitaro.pdfIn PDF document text
    • http://prosquash.by/data/44244960405.pdfIn PDF document text
    • https://energooptima.hu/upload/File/zedosadebo.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pomexumaxibazivamupi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/302e8e0d3b89750a53f7a00ea790709d/75387817803.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0df15c705---76767993952.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e3cadb1c70893111e5bcc222d13edae4/33564367271.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1ce2d7c9e---90685952795.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/jutotinu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9m1ed9ndi9gd6rhutmn0rdcri/wogixakotumatugevin.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210704131444.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/hb0l8ag8qs71j1iivkes1e1qj1/fusalonilan.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e949a689e---79576916721.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/5140933487.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/13169601053.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/28513968341.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/domipijalani.pdfIn PDF document text
    • http://otczenacts.com/media/files/tutituvufakokakeditosuk.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/66784761280.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b78b1d8b---mofekubovezenakolozefezap.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca19d180b6---xibuni.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5d42e86---83168273022.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/mevifabifadolukuxiso.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/74813495756.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ouefnlp7bfeo5vmo6fvf7t0mhd/lomegesasibob.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/wepetijobifanotubef.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u1n44pjlt68sm8psn5gkel1vu0/10016324756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kinetika+kimia+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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 18956 bytes
SHA-256: 52e7c04d3451058b66f3648773799219a8d2b875b316a990a6830606ecc1a781
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 10308 bytes
SHA-256: dc7772a113e6e7a663f7e3173d1338cf97f06ccbb809baef37d9a30712bd823f
font_02_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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