Malicious PDF — malware analysis report

Static analysis result for SHA-256 359ea0cb7acc8c88…

MALICIOUS

PDF

89.7 KB Created: 2021-08-29 09:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39e9d258a1166af01f2ad72ddb896c50 SHA-1: 26b4bee624f5c65fec1bb456c1d908fc64447462 SHA-256: 359ea0cb7acc8c8854ce172ed210686d79a5b94ba7e46b2b3f93a72d21403716
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/53b651b2de090a836ddf6404a7549cab/juzogedukozamafadavex.pdf In PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/1c1f4d17c59c32dcfadff8a75b2e5894/bezasiwefabuzukevonax.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3e4e784d---wipipukusafafugefa.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/84794700714.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/81434600835.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/wutivunuxuz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/13875b070e16248609962c4ceb90de1b/62899182994.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/sujegudazirajafunekiwo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/beraxibirabonolu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e2c65d12950f6a19afd4058329acee1b/lixore.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/mojakutosasoxalaxosevirek.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/be6fff79c9b61572bf1b611be5f0ef82/gevoganimizipavigun.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/biripetilikajiradin.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/75686395889.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/65310453648.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1fc88e060---javagezisunotomudojow.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/mebokusojupevupetajapoba.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/66647299329.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5d15d97b203ffcfd8b83e91e30ed8707/jonigebizevokugod.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29802631c---46733566102.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/15488510619.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/pokexofezadufelereru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+comet+is+visible+nowPDF 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_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 18864 bytes
SHA-256: 492bedc4ab1c72380320f5b8857bcfe055b36376704719cefdae3e62bf732a6b
font_01_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001410d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 10680 bytes
SHA-256: dc7d5be2691c627e949895b20496baac7c939209695db01fa01220fc0c54ef97

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