Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac89e9e05a461349…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 02:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a1319a3995984238aadac07cf081625 SHA-1: f5ce04503e3a4bb1d533b0f57d8fe082462fb350 SHA-256: ac89e9e05a46134911cfbb60dc0c7313f3dbcd54bd36f78a3dc7bc0977713063
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.catedralirodahaz.hu/data/editorfile/mavajajigamovadu.pdf In PDF document text
    • http://shiokuda1.com/contents//files/80150316732.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ta2rsj1mq42n13d09cq4380jt6/pojamekafesefex.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/dutijuwepoxomubo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/96594100423.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/oqgujlt8k5savpfimo6oc05uv4/fuwetimewumomemisonax.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/10748635421.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/vojib.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/wosof.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/48067013710.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f90aa3607fdbddfb60fd41df4142d786/32505750509.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/33248186989.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/92972226386.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/53057000847.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b54808f7---90831980527.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/77370806638.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bde3bc0f88c5d5fa79d6c91b86c7751/25153492843.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ht2ancfddmiu7vmbnqefk0bmm4/roxigejowosabesus.pdfIn PDF document text
    • https://cristalensi.com/public/File/24914029650.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210626_B2ED99B43A681B9C.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160babf8255048---ruderexoresuxilebo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sqkafmose5i39tc66o7d8nl4o1/88957477334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ktbs+textbook+download+pdf+2019-20PDF 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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 11208 bytes
SHA-256: f7d28d52562c0978d02702a9d65a511cb806315013e9296bec91035849a5adc1
font_01_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 19848 bytes
SHA-256: feb3cb6d6f89bac773a10243da28aadb9bf6ef06c439500b8b3964bb2c34332a
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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