Malicious PDF — malware analysis report

Static analysis result for SHA-256 d586344930119923…

MALICIOUS

PDF

78.9 KB Created: 2021-10-10 22:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3d45363701ec3e5a6cd3e86c94b9390 SHA-1: 2237279e9f485c1e5bf902f1ee0affa3a3b6dbdd SHA-256: d5863449301199239848db8217be8b12f052d0d6c79200c65fd9ba168251e86a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and the nature of the URLs strongly suggest an attempt to download and execute a second-stage payload, likely exploiting a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://antichigelsi.it/userfiles/files/nowet.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bc7sm4ia6pub28v5qjqh03plth/24486400981.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/75145098523.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/jiruw.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/33101553474.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/56704054045.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/baraliwuwe.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/defojetifevub.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/20424227075.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/69259147454.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/sunojofa.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/25860248843.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/lupefalajonamagaxipipumal.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a60d17a692---14722667034.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/salawubetudunejufevoza.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/30947783717.pdfIn PDF document text
    • http://azizolace.cz/images/file/17539750281.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615057eb22b43---60522795480.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/88430085441.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210906_A5A270B4A099E7F4.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/81216011079.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901071430_1336696146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=input+in+react+native+elementsPDF 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_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10532 bytes
SHA-256: b3a063e1087fd4b213462d57e68fde062b9383ef13d74826215e77dff404d8b5
font_02_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 18644 bytes
SHA-256: af5f461617790215616b62a98eb91da294248bbe7d1c2df5a92d34d5bb28dedc

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