Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa72f04eac3db2d3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 863d6042ed8620ebe99cef81348e8edc SHA-1: 360dcbfa23ec1c5bfbe11a1881b56877aefa4720 SHA-256: aa72f04eac3db2d30e1f29e6f5105c028443f88bcd932afc0939d59061bcd901
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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=which+android+mobile+processor+is+best PDF link annotation
    • http://avalon-essenzen.at/userfiles/file/wofip.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/mebupemexonekudumezibad.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/25752577402.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/23442475894.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/1929679808.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/84939738587.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sinibufemazolitojufun.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/lurikukovamoro.pdfIn PDF document text
    • http://csp.hu/editor_up/foroxaxelaguximovo.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/biguwem.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f0fb366d---41188441440.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d748bbd697c632adcbb8af783292b3d2/26802000388.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tke2qf8mnmkijntnojvb2dhvii/53370861369.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/56422117153.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xewixiwelokededizijixo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ef0fdccc8d9321c697f81ff5f95b165b/6382324664.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/85714548107.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/59507011940.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d26600a2---tagegilizolafejemidaw.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/95873507055.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/49318857389.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/tatakawox.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912155249.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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 17760 bytes
SHA-256: a6417c651c754cdb3a96f7e0bd236c2a8dfedd3f084227928a66d5a85aa0af15
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 10912 bytes
SHA-256: 9e56c7423425eebc778c27aa65ff807f60e654b131988b7e500470ecba61377b

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