Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d4835938578431…

MALICIOUS

PDF

87.8 KB Created: 2021-07-30 10:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4a8c7f9edd81d91981a5f3b53fa79da SHA-1: 72d142e755ecd4abce90d51ace402d61d04c4523 SHA-256: 14d4835938578431cd0e3983a235cc7bb255fd6bfbf99b1528d2f3aff288ab03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of a 'download button' heuristic further suggests a lure to download content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fnb-concepts.com/images/uploads/files/lubotole.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0buo65d14408l4r1sgabie2rv5/63570912692.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/93728331058.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/18617416696.pdfIn PDF document text
    • http://sivam.pl/files/file/92517213281.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/34033539432.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a99514a6615---vokazubetifewa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdc88ba77---bawajof.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/3458419556.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5d70b428680b8063381b25ee4fdd4246/36462788732.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/rang8gji8tc5nldtf8ubhko292/20137997602.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/18315969060.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/noxabirof.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nelufemenudo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0599378001619819683.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/db7absjb1pjqlokbgbs0i3dgm7/pifojekexawajegum.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/sugafakeropaviroxoki.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609831763ffdf---kamaxisexumukelosolo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029941ab026---pizefegexugisepifelatol.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26e85aaf7---88418034915.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffc05305f---gorasepomunuji.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/92445271856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=holt+elements+of+language+first+course+answer+keyPDF 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 11064 bytes
SHA-256: f427a7de83311b10c8489c9fee669115d721b36827de851c32201e8c95d3e6ed
font_01_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 20416 bytes
SHA-256: 07987692d77f8d715727bc55dc08af27dd5dc2db4167ed6505b0ce8bbfa9bb4d

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