Malicious PDF — malware analysis report

Static analysis result for SHA-256 463480f1272294f4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 00:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3b33aecdb24d52e9e74545168d50569 SHA-1: 53cbe5f51d5954d06e8d19f7e670c7175610470a SHA-256: 463480f1272294f48c0573c29f34cb57dd1946a7186efd812f49165523574594
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple links to external URLs, many of which point to compromised CMS upload storage or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cli-kh.com/uploads/files/202109221916229026.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9383758ce---sebikoribagunuguveduwisi.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/kafopoginawivuf.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141420103915---91691263840.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/91495782634.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/mujerexosetotojikepenama.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/pesonor.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109220714364353.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/76151026896.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/96812199115.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/93276579903.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904094236.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/ludubiduke.pdfIn PDF document text
    • http://ducnhua.com/upload/files/fakeranisurod.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/juroxomunirekowes.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/lojebutigilarefarukud.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/62504931238.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/54190751742.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/51491711109.pdfIn PDF document text
    • http://www.heksan.com.pl/file/19974797903.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u7gcdrd5u3augpjqqbkpqd8sn6/25493965884.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1632742176.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/faxanidufavosalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dreamhouse+barbie+apkPDF 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_off0000ae3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3F 15072 bytes
SHA-256: 3abe5a1af1d052b15a8a6adfe7cf76a411612037fcefcebb8f1aac09b63fee7d
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 10600 bytes
SHA-256: 119a2a6cb2da96617b811601b3e7bedabff14b92e428c929fd046d7e76c680d3
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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