Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57c5461f3ced9d3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 06:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce5817dd15e87ba8277cecf9ec15fe65 SHA-1: 7ead86c11273ed3003b1cab65afb063739417655 SHA-256: c57c5461f3ced9d3a387f8966a71af28ea123e09ff1ba2116374e06e54dcfbe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=manual+inverter+growatt+5500mtl-s PDF link annotation
    • https://zohopin.com/calisma2/files/uploads/18478562005.pdfIn PDF document text
    • http://knipia.com/userfiles/file/sufojapupoleviri.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/sanugemaxefipus.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ad5ec9effc50d538519b1ef3ff9fd85f/fesuvofuluju.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/99317562583.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/12501654520.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7f354d2442335cc235351e9efe6c56e6/41726662307.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/49910318236.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04eed9968---34381874536.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/99028915260.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e79d9971f---perosusobesav.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/79376693391.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/3432880677.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/47515189681.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ias5drfie2pom36o3mngvbf2v6/51589516373.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/96652979848.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160767363c5ea4---1881056648.pdfIn PDF document text
    • https://www.nlg.com.np/assets/ckfinder/userfiles/files/rutekemipo.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/gepabixuro.pdfIn PDF document text
    • http://siembra.me/uploads/files/ginijizex.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/kokodib.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac93f3585---tifemi.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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 10988 bytes
SHA-256: 6c7e6ff0339cc39e7b4be2f8e6dd0295ed8fe65e65aafee8af02328fa07413f9
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 18140 bytes
SHA-256: a63c35269992f304167f8fe70dcbeb9dd55535eee5607bd0e661e5999c896267

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