Malicious PDF — malware analysis report

Static analysis result for SHA-256 a318dcabcbbccda8…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 13:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 19adc9ab1b1b37f4c7fc3fa0764d9a8f SHA-1: 0c851a44b657f3c57c76272d41c556e83e8554a4 SHA-256: a318dcabcbbccda842ac304afad0dcba6e886756878d15de973ae2f81d60d808
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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://catamma.ru/uplcv?utm_term=exercices+adjectifs+possessifs+anglais+pdf PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nrj62kkhbh2f9nh85kde1dquc3/39085390972.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16072318c036c7---perirajikipotobalariwig.pdfIn PDF document text
    • https://ferropula.hr/files/furibulizenasuse.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfacaa319b---xenibixoxejunova.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d0045d04---932865502.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1c115624a979dee5848f13cd168042f8/fogelatonesoligove.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fdd142c8af77f85fcf001abbb0355be0/nabosisavaxetolemupi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/rivolawalokiv.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b5b18116---47791033665.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mouuu1l9ge2jhsob547ikb3d9g/mafubebasabufefoz.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/11160838288.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/nosuwarinuzulonuz.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/fazenopixasonopalagobubal.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/3430935572.pdfIn PDF document text
    • http://orem.mn/uploads/files/41582296851.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/36696940093.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3oh5t4k806p24lltarbpa7nva6/7320888890.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/1776429776.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0ad8f6cf---82952772851.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d827aed337---15693147220.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/97227839144.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfeae52d92a83b0e66b84af771849ffa/botufamevinaxisusotux.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e693247526e---90233524546.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pafizebukazududug.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/83023492075.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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 11008 bytes
SHA-256: bb5ae04dba83c80bdd480d986361ed2a764fdb60bc9e231f5529d0573d71240d
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 20648 bytes
SHA-256: abd8e99c6662ebfa333c530cc727ac7c1d8716999c9f325ef7f717323ff8ac32
font_02_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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