Malicious PDF — malware analysis report

Static analysis result for SHA-256 047ed53d3eccffcc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 17:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe03018cac7783d75658e0f52bd784f5 SHA-1: 2933ce2b9b1be5c20845a7e10cc1b65837ab3841 SHA-256: 047ed53d3eccffcce6fa09a6422693663f54bd6085d7227b0b3774af06a13c5f
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. Additionally, the document features a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=android+how+to+change+home+screen PDF link annotation
    • https://triatlonshop.cz/userfiles/file/48303016058.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/30726457588.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/30265616126.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11648242257.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/14330359796.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/12431306588.pdfIn PDF document text
    • https://rosycaffe.com/file/losasikinefutu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/44829127747.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ce1069632c3d1bda96d3d7af0ab66bd7/rimag.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/49869148455.pdfIn PDF document text
    • https://scalper.ir/data/files/file/65502266178.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/40978784476.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/powupitogulefegap.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/zisutikoruvu.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/pakemaranop.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/lovatoxubidimew.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/62891581312.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/13202874543.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/2780743270.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/3619936143.pdfIn PDF document text
    • http://18554080.com/userfiles/file/76796491448.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383391de020---retupujogizetusametuja.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/49827300219.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/64571572130.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h4gbgp3s963l8p6qh8bvhgjrc5/80834230892.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/20795815383.pdfIn PDF document text
    • 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_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10836 bytes
SHA-256: e77d35006c1aad8ef01ed759dafdb32a7daa73e0acb15aa11296b4eedfaeccf5
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 17672 bytes
SHA-256: 9de6ace348e5395abe982eb8e9c6d00f77c7835ca7f8ebefe299205be02de649
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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