Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d838707d771c86…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20a3c7b67a72902d3c759f78ca08e53e SHA-1: 9b984767fc4ae5b623fed3b991b4067c439cac86 SHA-256: 18d838707d771c867fad373ddaf97e06418fd221cdf2de69f114eef351db78e9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to the document's role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alphasigmaoverseas.com/userfiles/file/jujowolowiton.pdf In PDF document text
    • https://premiersuli.hu/files/files/rafemo.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/57572789644.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017db82db4---gudixivagupinimoxibi.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/47842224367.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109052033326141.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/12906553395.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nataxitunixijavojukikob.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/96683561428.pdfIn PDF document text
    • https://termoformat.md/img/files/14978417571.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/ronajubupizos.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jarogegugumu.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/nomubovavitewojujetomi.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/lidigarimijup.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/moxidi.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/sikofotanumanomonegi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613450c992317---41413006990.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/80264100374.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/guxefesusobijogavibilor.pdfIn PDF document text
    • https://unitjaya.com/contents/files/57231338886.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1384a4b97552fce05d90c706a6ac48d2/xozenimefoxinoj.pdfIn PDF document text
    • https://breedlife.com/upload/files/vunogexobelaxerop.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/mokexizixuforedenexotij.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/98896840453.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/waponuretuziganawikunati.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/4581790095.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310bfc5011a---45067888269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=8+ball+pool+hack+accountPDF 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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10424 bytes
SHA-256: f0586849f55efd3723d9905ce2e471c2f2f42d73a269acbcd54ce4dcc7f7f679
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 17480 bytes
SHA-256: 90d08df2f9069b934e6842e852b785a9377ecbf9de7102ef8978d9724b61aaf9
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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