Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ce3340053b33d…

MALICIOUS

PDF

122.0 KB Created: 2021-08-13 05:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4528b2614aff59d2591b4b83b283c39 SHA-1: d6e5744b0781c9cff97468feb10d7ea0a1457b34 SHA-256: a55ce3340053b33d3de2822605f605241b5d503c1beec2a0fd6b9f4cc7650e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://aiswaryamatrimonials.com/fck_uploads/file/89441587727.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f95051ac28d3b450dfaf18ac38e18f0/49985057607.pdfIn PDF document text
    • http://www.andreapondika.cz/file/mipulinelaxediwalu.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/kadalozadobupuvovinubi.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/waxixulo.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/98568441061.pdfIn PDF document text
    • https://tivicom.vn/upload/files/poniviwosojojoboxix.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dulewe.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/kuxiranefudirapogomot.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xowukokerezokepas.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/fuxuzemata.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/8388834851.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rud83km28cvh1i1jfviaevntfo/41174534342.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/kolofumuveno.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070252d85cf6---nepabitijukewegum.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/76ae24079dee23377cdb9760052c3368/bideruvunepeve.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/69625678056.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c76144d52---95900724076.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lubixofezewirepozetoj.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/devupikemezisi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f119389bf---14729607870.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/85817352073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejemplo+de+articulo+cientifico+corto+pdfPDF 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_off00017615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E2C 10828 bytes
SHA-256: 59110b7945824b1eeff2ffa87118d51cc92dcab77cc20ba1a2503201f412c6ed
font_02_sfnt_off0001a707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A707 19248 bytes
SHA-256: 981c6233aa9e9ad7280765dc886601d6008c0f7ebe003d4f51743508bb1fea93

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