Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c620454be5b338…

MALICIOUS

PDF

86.7 KB Created: 2021-07-29 17:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22e9737305321d18fe911ae865b5b685 SHA-1: de6f0995f07e478d21a3648fa4b28539625f4d39 SHA-256: 91c620454be5b338f6f82a07d6cced35f53af15a98da9b1db725214e5b783542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f825ccb8bfa---tewikikaginizuwuzorixonib.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f63c4cd4c38---kejitovexusevawamoxo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a39d407a---75361173577.pdfIn PDF document text
    • http://candientuvibra.com/images/file/giruvasafid.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/nabisogojomuwixozuzutolo.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d652bf1497---89311121234.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/53599209832.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/gibefelividedanozulig.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/vadava.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/kozubowebapexa.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a315938ac5575449ca51e5ddf5951561.pdfIn PDF document text
    • https://lasanisports.com/files/daxozun.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/fubolexirurimipofipo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/t0gcsgm3vpj212eb1i8kkc425m/43617167361.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a6013fab75c788cb644b7b9be924530e/xaxobemotodunut.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/43725439182.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcfd1a00e---rukibagediwonekuxowozavuz.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/5971960320.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/80346741373.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/36877072027.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aec3db1ce---79318468148.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/vinaxikuzuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=descargar+un+clavado+a+tu+cerebro+pdfPDF 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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 18464 bytes
SHA-256: 041ccae43c0472350f5dfcf2aa6ba89ac2d7d73037ac02ea337b83a6d3244c9a
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 11008 bytes
SHA-256: c51483cb114e5b7d579d9e02ee494c8549443a2afb77dfe105af4273e4a66d86

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