Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff93cf062a6c7f6e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 02:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdf9cd52ee764089bc67c16c5092ef6c SHA-1: 3b0c1ea94433e5eba20d21de536d0a3d8efc3608 SHA-256: ff93cf062a6c7f6e2fd5a7e5026d68b5ef23a47a2d8bf0a9798e98eecbcfa3e7
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggests the document is designed to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nsck-cykelmotion.dk/userfiles/file/57951545326.pdf In PDF document text
    • http://eurekaelearning.com/upload/news/file/53272545437.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7e4439bb---83185651243.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/6354806751.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f71a17f878ccf767ff16d675258d172a/24326661030.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/26734792776.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/18530222339.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/46501605093.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/lefazobazikaparalilavub.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/jonevesubelovete.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/43258278045.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/61569779668.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609412f812c9a---xalofanegukasa.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e168f6cf---28325345797.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607255c35303a---48577040724.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/96085836657.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad142a1c9---giworiradugiduke.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/76501459912.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec8a781bd---vovebage.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/64212651516.pdfPDF link annotation
    • http://cuanhuaabshanquoc.vn/files/20251761651.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/pilasepojesatigesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chrysler+2007+sebring+manualPDF 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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 11012 bytes
SHA-256: 1f104595b07a5f8729ad2f8e80ff2c55399e113dd21690788fd38c0a933e3cb8
font_01_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 17284 bytes
SHA-256: da962f08fed870cdc95c8375cd69769b4c5bf4d18bcf737744ec57ce06c3a2fe
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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