Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cc67cafbb19e3f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 17:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40c9901327c6c0156e3c42182ee65385 SHA-1: 15017e600877f0312cc5791b967006ada7e57859 SHA-256: 37cc67cafbb19e3facfd1ea58073daaff79028b67f1d50b896a274656b28eca7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. Heuristics indicate the presence of link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the true destination or host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/38c703e182aacbbeed97512b38bc979d/ninaxigimikexit.pdf In PDF document text
    • http://improntediteatro.it/userfiles/files/94635146932.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/majizulilunadowosomigaguk.pdfIn PDF document text
    • https://kimansion.com/uploads/file/divufalexazolazis.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/40075570417.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/46628431870.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/tuxisaboxidus.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/68189164931.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/30999682930.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/97083934536.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/xajabusutonabekuno.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/20141378836.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/basizadunikikabe.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/99279256467.pdfIn PDF document text
    • https://epiphanych.com/images/file/junevudagevujuwegafos.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/15259462012.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/murexijojudexepafukovova.pdfIn PDF document text
    • https://slide-bearing.com/d/files/13764007512.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/46931935003.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/f4k0hp921gn8qig2p1lcmjjlal/risebeponofebonorumapopux.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/vezawuketapefivujuzus.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b7366bbef3cd0590cef9ba40ef751b3c/53845613468.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/42806096657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gcert+std+10+computer+book+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_off0000b5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DB 10924 bytes
SHA-256: a6b3239efb0e6abf8b062c3bf0a665cf256f2c6a7435c2777f69cfc9eb42a009
font_01_sfnt_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 15828 bytes
SHA-256: 344ea6e758bc3a34d9e0f1e1a4fe59c9ce02fa27917309b4f74978480e3692f8

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