Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3cb970747b0152…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 23:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1512d34217cd76dcaa0ceed93123e9fc SHA-1: 6f2ab958259b923d4aedd78e08282d69378a68b1 SHA-256: 2c3cb970747b01528b119f4371a63e0d9a69685a0d2aadfd4fb4420e438cab32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=ring+of+fire+ukulele+pdf PDF link annotation
    • https://villanakarin.com/userfiles/files/voxofefuwuruwegotami.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/toxegovoni.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/jebibumevawunikujazuxex.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/69080766253.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/49017108451.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nupij.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/barexevok.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0484dde4---13600905454.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/puvivixozapimizo.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/61092215652.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tugoxigimigemanotaxulude.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/vabotuwiku.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/7494333078.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/90746628120.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rret4qds5cvan8cijfa8q966of/dunefakulebi.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/64909955602.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/ritetalakamabajuno.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/4053051456.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jinexugimemuw.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/totoxenuvivuxefafixit.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f101a5c76bf71b4bcc8d5088f0c72b21/41462967675.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614212552b034---vomozivizezitawe.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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 10480 bytes
SHA-256: 42fce788ceb280b685ec9281bd6d1f6e7bba21cf82152a4aa451cafccc446631
font_01_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 15224 bytes
SHA-256: 7137183927fd5a0cf8d6e9ee4d7980fe3f282325b728574ca2f725a54158d70a
font_02_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1