Malicious PDF — malware analysis report

Static analysis result for SHA-256 4598ea33c1b41e90…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 07:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 73185a51c759ad1f7ab74926935a1276 SHA-1: b98be7fdacfcb5f7c908cad58ca3253485523e21 SHA-256: 4598ea33c1b41e90d385ce2dd0c8d4617615453f739998005b76826ad7cf6883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest 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 documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=airport+madness+3d+full+mod+apk PDF link annotation
    • http://icbiz.ru/userfiles/file/xufufurun.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/pilisozedosanuje.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/xegonogotu.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/fanatinebepefubazugevilo.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/fulene.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/guwopivud.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/19938823462.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/64587663294.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/66460382109.pdfIn PDF document text
    • http://119pump.net/d/files/87431264524.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/vipusibozipulobinaz.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1601a9ff2d8660e117fea981d97c2e2c/jopizokaxofinisorewun.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/22079134635.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109180715281855.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/84805291153.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/7237500909.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b759ca49---depabagewejar.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h4v2oa6m2fdfvd7h5s6dsngm15/dusot.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/3086040029.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xomalidiwug.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/74950836706.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021924_10580_445.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/pidalojomugonofevu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/14645231027.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/puxojakope.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_off0000b173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB173 17408 bytes
SHA-256: 1c3eb932e32fcb31a71414761ab8db4444d07c967c510f7d62c87e7ccab66338
font_01_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 11004 bytes
SHA-256: e51740c2dbc1f69f4fc70fde48da33ca96ca8cd4aebff0d7dbc58ad6d52c3ca4
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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