Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea6b6a1e7aea8f4…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 09:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfc96d2b330acedebf28109086cc98a3 SHA-1: 0c6732f5b2d5eed20024e361512d01083be4da81 SHA-256: eea6b6a1e7aea8f4b85f52cddd4b695c3c5862d4a7bdc35d05b107d9fd3ccdee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://phuquytravel.com/nguyenvanlinh/files/sifoguluxa.pdf In PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/86495875644.pdfIn PDF document text
    • https://mangallagn.com/images/file/3452523748.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/38107473760.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557725db65---68642980997.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/31351236391.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/mevab.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fogigujogukeref.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/wewiginubagekur.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rbf9bjh9rtdr0dfpvkkp5kibmn/nopejotegasuvemugexiwu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3af4df387751ae3f2a99c2d8aacca942/70115131855.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/80a4577c05aecf0b007d1ff02aec5d22/62380682089.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/45517768269.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/a5ag2mhi8j1mdf5gp2d7s4uoe7/78539385878.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/50032289010.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1446942414608d12d613898.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/fazajabizene.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/ledewodipopes.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/28654268852.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/wirexipifafibeteb.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/nopuwusi.pdfIn PDF document text
    • https://duvanco.be/docs/files/fadave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+set+a+manual+ip+addressPDF 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_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 10728 bytes
SHA-256: 6237e0cdb8665f4fae446b363ded5a289e9fb9f1f2dba576c4fb27623fb80b20
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16372 bytes
SHA-256: c7e854923d22effe90e02751ea6c9fb898e1a0e67ae1d14c89a9fe8dbefda7c9

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