Malicious PDF — malware analysis report

Static analysis result for SHA-256 3826cf0214684be4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 00:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52bf43071cf4a1af70975b70dcfa8fb6 SHA-1: 5f6e60cbb920ed0bec3b6e8d54d0f428c272f814 SHA-256: 3826cf0214684be492bd44a57099a5b93e49b45135cb5e21e1c7faaedb1ee07c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://affectif.ro/data/Image/file/juwafuvijilun.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d1c10305---27706787232.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/29743770558.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020207416545.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/wegiwewevivukifaboxetoj.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/29064422161.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b7a3134b---4828000109.pdfIn PDF document text
    • http://hongdacable.com/d/files/tenabik.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7139b7d1---xezerejusinojalewox.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71027292863.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/95928515382.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/87676903894.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138913326616---rixinufiwakumaxinapi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/38604021439.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a14e617a5---41571030321.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/nupaxowedunodojozigot.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/tagif.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/poziwavefirapifute.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/jumobutamuzurufupuvarosis.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/vemilatabapefudiriwo.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/12878063656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=names+of+different+graphsPDF 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_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 10876 bytes
SHA-256: d99085a25cf45597860e261fa336959c95f44de18f9162891ecdb4dc3c69e548
font_02_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 18064 bytes
SHA-256: 87fa80d976ac0f1186b6aebb35eabbc6bc40a7ede405af41108673d61dfed424

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