Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cff6c9eb83b6477…

MALICIOUS

PDF

97.1 KB Created: 2021-08-19 00:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1dcbca07d38c07f1a9051a664e8f700c SHA-1: dbf25d25bbe3fa1e99f1db362ca57d559e1abd03 SHA-256: 4cff6c9eb83b64770d2cfcacf7069d4f084ab00cc7653c5264e6780ce7ac23f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://jshtextile.com/UserFiles/file///40907135922.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb69ab086a1cb168d60f021ae0fc8f3b/tegakokelinesebosusok.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nojor.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b82cd64b0132134dc38cbf7f2d5f69e3/80048511927.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67046b920---losimovobunetigekatoja.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/28657017563.pdfIn PDF document text
    • https://jotelek.hu/files/file/90283074619.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/davezi.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/nabijexunuzuxuzikuvib.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/zejamubajuzipalas.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/vatuwezo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c98bea66---75090620096.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be3293786---6287352640.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8ffe08ec8a7327cdf15a24c26c5fa28d/14806392554.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v9c57c1e77677d6cs1i797t37m/zogiwelose.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ff79dd94---tapelafezugewulare.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/juxujapereton.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/xuvidowudofenimozizip.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2e5eaf57---kegewegu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d492fe28f6ba6491995011abed6237a4/dogoxopazuv.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/68415366674.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/25d8ad15697519db479183958c2828df/82291103514.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/69297587610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lista+de+verbos+en+infinitivo+gerundio+y+participio+en+espa%C3%B1olPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 17160 bytes
SHA-256: 0031c3c2ba3b90d97080a977e9401a565477d1436ef4c4b456ff0784fff818bd
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 19236 bytes
SHA-256: 4f6fb5b02cf21a1e3d2eab0d5e4b3c58607515a0c6e85969037345b132b62cdc
font_02_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_03_sfnt_off00013ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000156d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D5 11380 bytes
SHA-256: f8d081ab491f339c59d869aee82ea4f387623b1f7f5b98693e41f9b847206439

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