Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f595de983e9fd5e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 21:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b16e4d27eb7172570e5a467604af250 SHA-1: 6f9cb3c8d9348e488c32819b08debeafd09d1241 SHA-256: 0f595de983e9fd5e5746824757eda5d2859d3444f31027ad79b070cd866a845d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a link farm for SEO poisoning or to direct users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://laborke.ru/uplcv?utm_term=tekken+7+ppsspp+android PDF link annotation
    • http://beijingteye.com/upload/files/46758319665.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/74473835957.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109070226157067.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/23515594263.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c1428b97---45869748905.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/netusasiz.pdfIn PDF document text
    • http://pbpharm.com/upload/files/92684399725.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/bonetuverunib.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/merozozuwisewabotobez.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ql3qa728hee8jo4i9cad1tvp53/79810587247.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/tepevi.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motapu.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/xeginivavabog.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/todolopata.pdfIn PDF document text
    • https://bak.vn/upload/files/35039807278.pdfIn PDF document text
    • https://istanajp.com/contents/files/87671607879.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gesopenigig.pdfIn PDF document text
    • http://artdental.hu/editor_up/gukegamomumobuwamivedamu.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/wozonuli.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090521145980554.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/wiporevudejexawuna.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/satasuzunamu.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/51826088510.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2b31bf2---89070672131.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/sosasefagepuwat.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5479cc510c86ccb6e5139cdae52fa17e/49049989893.pdfIn PDF document text
    • http://goldmustang.com/files/files/rakop.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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16340 bytes
SHA-256: 8279f9b6fe742082707080dc54328b3539fb097ba0f5987f0c1b2a42923374a1
font_02_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10348 bytes
SHA-256: ef50f59e7e468a71d80836d643b86f7b84968a2f762fa7540646e5bccd608cc3

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