Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed01f6ceaf6e917…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 02:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d3bd444872a43cf711544f8bb0f0be6 SHA-1: 9f7833fd299f4c4002aaeac2a50bec7e5d0dbaaa SHA-256: 2ed01f6ceaf6e9170b5a173653af30baa947a40f5a517858366a4883ad75e906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external URIs, including one pointing to a compromised WordPress upload directory. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the phishing and trojan behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=a95x+firmware+update PDF link annotation
    • http://machin.kr/userData/board/file/14636116653.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/99941101831.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/73843791571.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/99853787843.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/7643134491.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/53737006035.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/fomugaboj.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b048f01f4e---sovomimoposomexefakodera.pdfIn PDF document text
    • http://tfforming.ru/d/files/93898000393.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/letek.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/38132833968.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/fenabowu.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/33210506652.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/12853709040.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/74808603846.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/47267301784.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd498c6ba---21046643086.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/temejuwonarupawepoges.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/tanafufovijopi.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/takikodovigonajata.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/78079312657.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/89351703901.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/91784852389.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300cc626461---2430160603.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/ronajimunubixadobado.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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 19268 bytes
SHA-256: 1e3a2aebac72aaa000bd318b84df215133871de3ebc384c7445484314f4d502e
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10792 bytes
SHA-256: 8375817cbbaa83c43de4b2becefb6cb4436fbd1a521f91d5b3d8f56fbed62c70
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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