Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba847dface3ea878…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 05:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8428488f69a78e5db7c7e1dd0dd0109 SHA-1: 295732e1254bc66ca76f9acb5ab2649c9286e6bf SHA-256: ba847dface3ea878753e36e59baafdd963b39d4260d224ab5499f6d8e1a5d378
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files hosted on potentially compromised websites or disposable domains. This structure is characteristic of a link farm designed to obscure the ultimate destination or to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the interpretation of this link farm as a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://abwplazaview.com/uploads/files/sunixufovogasanewedulu.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/73840705852.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/pelejixakudiganorifijuk.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d888963ace26787a6f0fec32472db595/komibepefatewijewekus.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/98596334822.pdfIn PDF document text
    • http://abwrva.com/uploads/files/salivoxorudixetago.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524e71c92e---54995298111.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/fb0a0c7b09ad9cf0afc66806a348eaed/49599638002.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1bf633a1e---20808775121.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/sumafatujeluterilafaf.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1sloq0at0r3t8rithcqr3mlegr/65852552910.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0ba4a2cd873b79a758cda68924efc0f2/pamimuzujaxejibafo.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/dakadopexovugi.pdfIn PDF document text
    • http://arablift.net/userfiles/file/47647677282.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s4klac85l69u80hpgp7oe3mrmu/musubijipojefazomuxonilak.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d04b9a1a2---mosexusuxagego.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077335a3470f---towulugorijenofufow.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a21fd0f---dapawuliwo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093fedc801b1---zumoxomafitafo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722abd18ecd---81366038535.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/16053178296.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d642948ff---63042256224.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/solujur.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/nutozesabakidat.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/954a2d0303de6e3533e26b94723c9e9b/lasobarage.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ce76aec0---xupebanatiwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=different+classroom+management+stylesPDF 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_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 10792 bytes
SHA-256: 7d06be1ce7a9880da083f0ed33171d56a45310ef43a2fa5c3f078b1a99dadaed
font_02_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 16508 bytes
SHA-256: a8ead3da77a017fc999d84aaca41050da43068669f7254b76c0fb7514480bc87