Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6d1ff8950fcadb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 00:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa98b6d840584cf477070523bdf444ee SHA-1: 1f9d3f355d7073e7b4448be3f4e2fb1adfb4f019 SHA-256: 1c6d1ff8950fcadbc7a5381c3387fe205aa0d2e6debdfa112cc49d62bd909523
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirects. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=hack+wifi+rooted+phone PDF link annotation
    • https://advik.net/userfiles/file/fopajiwofosilulela.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/pigolazofimime.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0338fdcd---venija.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/41753314973.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/26244759607.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7502891a---rebate.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/depobemipovowulevivif.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nozabuxaxozuzasez.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/35689089147.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/56548088578.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tuwax.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/nitukivotodosawop.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/65296828316.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/mepixunotenusamaninav.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/90e14f7da728506e316ce208d5d02c0a/tisuzoxinuzu.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/45504100817.pdfIn PDF document text
    • http://heizler.hu/files/file/56298726938.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/fimabitamuvumaxigatebulol.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/67015985242.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c59dc100---19476491214.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/73658315760.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sosiwon.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bujikobamaforiwibabino.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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 15384 bytes
SHA-256: cebb501d911f04e919e68b58fe67e5ea70c325d83d37820699d9ee1b60f613bf
font_02_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10672 bytes
SHA-256: f91d289ae3b9d9d879276cd83272db900711c3d3bb4fbacedb27a5cf0a5329e0

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