Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3b9cb351dff236…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 04:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 827695f9b0c07552af34200fc7f63d44 SHA-1: 68f4d866de72165f7f6f2e530af853bcc41d48b6 SHA-256: 2e3b9cb351dff236de071d291421601d764aa1cb65b52d17b1eb8b1d139dccef
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rapabzenec.cz/obrazky/files/xutolotepapupo.pdf In PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vusek.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/duxetonusixo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d590f4c6---kabenem.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e07fd8771---mojojawejiragi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61cf2e1205---45458885193.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kobumunarinotoduvazob.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e557f4fc9970d4e5c7c3ec781925bce3/6568212678.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/e33e99f18f73d7cbfca2e70fb765c395/68126620274.pdfIn PDF document text
    • http://gptools.net/userfiles/file/faturaxapuramofumumilu.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/zivek.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f4339fa08be5f865593e1333ae83ef0e/lajetuburiwad.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/10133012497.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c693c59d30---zuvajuvebotobuvukuw.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/zorigaz.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ad3ed3120e83b5d7e1473f7476d4b921/fuxisojedid.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16278410488485.pdfIn PDF document text
    • http://tai-group.com/upload/files/37220429396.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/pifowerifilelusi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/sudixonumirematuzo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/082215195c4ed538ea33ec9088bc81f9/92039018979.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bd13662ee7b---40729379695.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/52408176778.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k4in8s19f7niava2fcv4ugukqh/11289891426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=codehs+basic+data+structures+answersPDF 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_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 16636 bytes
SHA-256: ec8a381c76120ddeb3ee5b4fc4ef0c68196ddb664ebb5d5bee2132a6d0be4798
font_01_sfnt_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 10776 bytes
SHA-256: 54cb45ceccc50ea999d29daba447bf1fb6b4588e645fac523d98b8668b3b9579
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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