Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ece86b3da1d2303…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 13:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d4d3d3d5f3ae8c98193c75afe90f902 SHA-1: 0fc862057c6c2903fe23627ef5a9b8984ea3ac06 SHA-256: 2ece86b3da1d230327ff29e34506baf813c6904ed4aca35f503a293567ef6c4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan implies a malicious intent to deliver further payloads or lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2d282b9ca---welatokunad.pdf In PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rewon.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/fezogi.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/67383611991.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614af47a60b88---paxof.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/kopinisulip.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/80475309118.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/64617547517.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161502d3196359---wufusujilimavak.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/sororuborixukexutubefojad.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/39765751977.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210913182006_lnajxp.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/30315753016.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/vonorawoxamuvaponumi.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/55433731905.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/4450412847.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/zojafelujani.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/81936015110.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/giwezujelipimijob.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/tujigu.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/97755483213.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/juwoxukikukijemesumifex.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135367f6f2b4---54713810842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=scala+android+developmentPDF 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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 18280 bytes
SHA-256: c1437a19fd0be14be47235b059d78c1414b94dbf1fe71fd1c5031e595ab1c815
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 10648 bytes
SHA-256: b57287e3ff075d21c7d498f090fe886d02b6d7fc5b20864c2289f2df4b86f3cb
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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