Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca843eb50006fe0c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 16:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2458fdbbf850e1651853ffd2f1b349b4 SHA-1: 485c88dec9053cc392f86df59d03f7d2e92da202 SHA-256: ca843eb50006fe0c33ba4766bf1ca4eade9abea38481c7b40e57450a1345f3ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://smidgel.ru/uplcv?utm_term=android+11+official+update PDF link annotation
    • http://signfabapp.com/ckfinder/userfiles/files/14582658278.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pimikatidane.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zavebedosaxos.pdfIn PDF document text
    • http://telecycling.info/files/file/noxamop.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/56096973949.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/74102648677.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/nobabugubebomi.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/16747632680.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d2a08f94---42828155711.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/54303570369.pdfIn PDF document text
    • http://melabo.com/upload/files/89220735294.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cda1816783ad36ef97e7677c0ed7799c/muwisilegogimivipokubajon.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nesuzorofowapedoze.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/40278862015.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10173170141.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vewaminuteb.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140638d5e268---50430467186.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210901_FE6846A405C167BB.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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 17660 bytes
SHA-256: 211b254bbcef50d4a9f0b77fa24c88b1df5276a92449e62bb6a120e2f7d3aa04
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 10576 bytes
SHA-256: 08cbb862ccff9dccd9cd5a8614d359cebe923ca20b9c6cfa53cb1869fde77a1d

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