Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60510a68e0bdbfe…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 19:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87f5b7b9e3b70dadb68806dbda480be4 SHA-1: 4838c40c2beac548fca61126f65ab3d913b305b3 SHA-256: a60510a68e0bdbfee55994edf864518b7aa18fc57cb7e489af055ec199b74508
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple links pointing to potentially compromised WordPress upload storage and other disposable hosting services indicates a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://sentezetutmerkezi.com/upload/ckfinder/files/67335741693.pdf In PDF document text
    • http://wjcopy.com/upload/files/senisisajud.pdfIn PDF document text
    • https://mbbs.hr/files/koxikozinideboviwiluju.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/52246726254.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/64986558747.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210908_5642DF30F81F7C91.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/mutitejozukidoduwutuw.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/pumiporutu.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210926123324.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/24073525625.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/65081419661.pdfIn PDF document text
    • https://robertbah.si/files/file/91219012212.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129a5cccf4---66491423910.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/9480559062.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091121531591.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/nufewuputapotoz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/55995a07cefe53fbea30ef46be9f4171/81455453777.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/ribuf.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210906101754676203.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/55029836564.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c28bcbe117---91146641937.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/nufula.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/52934570471.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e391a0c80---morasupilamamujimotada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=equal+to+its+supplementPDF 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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 17476 bytes
SHA-256: 4355fd5c40c625a2271d305688c99d74e2aa5b0edb595c85c4c3989a2743b6db
font_01_sfnt_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 10540 bytes
SHA-256: e1ca09a871f9b4fe84b2f12e84ee0ead98f123d118294ab167911c5aa8eafa73
font_02_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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