Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3eee837321b874…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 06:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b094d8bf2305e25867bebe4ac046b1d SHA-1: 336d7eee4ebf9df90ede52f7fb7f318902402aec SHA-256: be3eee837321b8744a2b506c9059a794a2660e767b88d6a30d0967e7fcace8aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The presence of embedded JavaScript, flagged by heuristics, suggests potential for further malicious actions like exploiting vulnerabilities or downloading additional payloads. ClamAV detection and ML classification strongly support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://snap-drone.com/userfiles/file/pomamagi.pdf In PDF document text
    • http://findusafranchise.com/files/files/rinununavoj.pdfIn PDF document text
    • http://katachizu.com/img/news/files/10984095071.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/losufisebuvemi.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/54043973268.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/63929283601714146e23f2772b505beb/77813577196.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renar.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/6437516380.pdfIn PDF document text
    • https://kiptep.ru/file/wexilimabesoxafefusegod.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/16964825969.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/xuresikapajorulorituvuk.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/tinazoludureda.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/36756432885.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/winitizojebatoja.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146895f70cd5---sozutezidorurojeripetazig.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/danula.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/rutovalenetexuxoxut.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/divofeveda.pdfIn PDF document text
    • http://topstec.com/d/files/palonig.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/49327f406ec6732ccbae041ebd4308cf/11299893101.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/kaseguz.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/85398794670.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/25606403913.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141af6ac7210---75675574926.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/14289727315.pdfIn PDF document text
    • http://ciskmv.com/css/file/nuripalovorenikexove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+apps+for+android+car+head+unitPDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16904 bytes
SHA-256: b0b911fd80d253378c98c83dab1e5a52051b9b65762b68be9f40212085e8b2ef
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 10824 bytes
SHA-256: becb7ca975f0205592221b00bb7fd671c47811f58dfc951c64647281fbf60455

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