Malicious PDF — malware analysis report

Static analysis result for SHA-256 6145549dde817e03…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 11:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 728cd454ed5439a955e90bc66676b709 SHA-1: 5c14843d23e37b2f84170ab812e9e2734ee021a9 SHA-256: 6145549dde817e03b26365445d79c1430efc63a73413955f2f8009b48953dc75
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, directing users to potentially compromised websites or IP addresses, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://denki-shonan.com/uploadsfile/tatoruwolebomonero.pdf In PDF document text
    • http://kkslavicin.cz/sites/default/files/file/mopapubarusupimonulej.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/38565152009.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/46643068791.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/86317162097.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/26711368782.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/damivinofotofobute.pdfPDF link annotation
    • http://speckletrack.com/update/editor/file/14138300979.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/25318332825.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/sesapabadubevosez.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/lagevobirekodujiw.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/mizexajutig.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0319f4ad2c7eaf31c4794b71a61549d2/51395005857.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd1c1e367---dokakoten.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/gumerevutazulaguwanefepo.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tumajaweleforux.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zemavepezuribub.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/ratiganerevakikibi.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/suludulowa.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/lawofetevilefom.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4cb0574f7adfac357da4ebf2b6e08645/24072611409.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/4537106943.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/rovujibosodufapisep.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/pemoroza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=business+research+methods+questions+and+answers+pdfPDF 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_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 11224 bytes
SHA-256: 6b3d1597d70a63d852415a2624e8be3f93d409b62e41056ae20cd9ff6ff7c728
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 15932 bytes
SHA-256: 7a53ca4fe3fa239f34feae3cff74ea857be64302b511f27093057f5618a4b37f

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