Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f15dff84c46b123…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 17:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 846175531b73621a584c7421a8488d7c SHA-1: 1d1eba81f3005b855b71cfb47cd8695e27029081 SHA-256: 6f15dff84c46b1231b7490edddc0e00e3b4598ae58a1c6b4f708420829d7e6c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=fundamentals+of+marketing+book+pdf PDF link annotation
    • https://likeevent.it/writable/public/userfiles/file/jezorokalej.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161400fa13baf0---dadejuxawokivube.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/47348609756.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/bunabusaratedatax.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9d9e5d0b---lulogugefepebod.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/45271049973.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/panawemonirepa.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/ketabilinunurazanusa.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/18609872807.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/ruloladefi.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/48273959527.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/zexajejadajopuvujuzoxi.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/58371003852.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/gafuru.pdfIn PDF document text
    • http://schubert-hh.de/image/file/23398538647.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2e4ef995fea62abe3241d96cf31bdec5/vifibuxu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/kenokezuxukozufirofut.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/julezajalaked.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/96494044485.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/tiroposoxawiva.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613874d3384fc---20929355913.pdfIn PDF document text
    • 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_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 11152 bytes
SHA-256: 6f2de88cb6b33d36ea8c7d2d343a3890f6b98515bd0eff208e4746ba1f7418f1
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 17332 bytes
SHA-256: 99a8b661ad9c7b7cf7433723293da25e0d66d2088a33e6ead5af784f6f48b97b
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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