Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a41a54c7b8d0c8…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 08:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cc5ac61388d51e7d0f85de9db15b7b0 SHA-1: 589fc07bebc5b2cba21ed2d4d4258ba400cbbb94 SHA-256: 20a41a54c7b8d0c8b13d3eca2b7e98281417b8cb6720b59c61443aa09131694c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://nomylo.ru/uplcv?utm_term=metric+unit+conversion+practice+worksheet PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/eps4ca6k59652nst8kive699p6/16713841833.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/32442735983.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/dawum.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/11191b399f67b919a4940db99c42d224/94832984455.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/geworejakatafem.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gfh6ogj404ek1vivo3hok9fobq/46990775238.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8460e436053dd4a51a65d49de24d2634/nememinalipidinori.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/99657299916.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89d159cdc---85287094399.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/wisotusuwananiwaji.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/juromemogaw.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/31544256736.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1g1jqcld5o7b4njdbbnkl5qdko/46535317080.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9a4cbc934---71745583846.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/fetixikudupetoxusoba.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/92431547601.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/liziwe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ba8629c48c71db6da69167ee887c3688/59518113191.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc557068043---54190768301.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/58755112999.pdfIn PDF document text
    • https://7gking.tw/upload/files/28862784239.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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 10764 bytes
SHA-256: 75295d906448de5d19b1e35a1d52aa108619559bb6590a51b98d5284e29ab447
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16780 bytes
SHA-256: aeba2659a52370ca03f6789a8cea1f35411a6dba8ac0f4b72a23d3d9b0648f64
font_02_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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