Malicious PDF — malware analysis report

Static analysis result for SHA-256 8127563faaa26d0f…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 10:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c22c974b06d5ddabe83ef41e9ecfaa14 SHA-1: 55e3ebf45af4901ed017735785244f2832e6d8ce SHA-256: 8127563faaa26d0f108ff1e6a7230abf89e101d17806d17400b9421aba9c8d3c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, it features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host or distribute malicious files. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://somogyplusz.hu/files/lowafoluwabatujaronesanox.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161125511eb568---58961712242.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/47002830625.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93076356f---41374789221.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6887465d19108618bd271ded20f19915/94764220848.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/30ttv1kogrcshskbgi43d5m6a5/74180628507.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/86661876195.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6b3bbf736879d5207fae5eedab456ec6/bigomifodezekodesidajax.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/h66st8gijkiaihu6mvt861hhhv/29005446539.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd97621ee---rasobezibefax.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/84960668656.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee65ab5c2---74204927564.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210817003028.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bujolisonekad.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2ecef700ba17b71a44b70d0a045268a2/timewatuxibabidixazeneza.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062916440771.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f380b3824---petemedo.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/lararolupefenub.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dhf12li6fakhv8fcipjecq821b/wowan.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/mizaverowa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/95218372538.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/98999017114.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebalavike.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/72965398494.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/23260643242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ilac+example+answer+contract+lawPDF 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_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 18752 bytes
SHA-256: 03c68ad433d45aee8fe25fdf751546929d9d4720368d48f6ebac1485db07a8e8
font_02_sfnt_off000146d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 10584 bytes
SHA-256: fba243137c80ca8361ede8e95b77454d406d53cfa233a5c764fa771405580b98

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