Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b58e2d8839500d3…

MALICIOUS

PDF

86.0 KB Created: 2021-07-31 15:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a54dc6b8a4800dbc32abfa1122a80924 SHA-1: d95901b05499785d4b5e709cd01d01863026fbeb SHA-256: 4b58e2d8839500d3d00a9e5ac67c91a20f404d096796cb832fd49669da6fa49c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search engine results or redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities, contributing to the 'Pdf.Phishing.Trojan' detection by ClamAV. The primary attack pattern involves luring users through these links, potentially leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=how+to+play+the+hide+and+go+seek+game PDF link annotation
    • http://andrelandberg.com/userfiles/file/85512342987.pdfIn PDF document text
    • https://immobilgold.com/file/46218573685.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/moxizugegesolurugafivu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/60232303658.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fb74660n4fprg22f5r5bc43d6l/mawujaro.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fafc94dd---35292347933.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/22002286702.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/acd267ce48b3443fd5a563b7ac577810/5189299217.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kavikanajum.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/68360891691.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c2907b61---zanupaxobimovetolemaduwo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083f39474f4b---ponolekumono.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/jigirozinawezuzoxivupuke.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/53460745433.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/322946ea9dce26b9113793476573b83a/bevuragajidugosaposefa.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/zigijiwedixolovadux.pdfIn PDF document text
    • https://wagaskar.com/media/79321820046.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16244430606411.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607133add470d---rowabavabunepogirekosu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e926db6f---29756258632.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/fekekojufajudebifali.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11020 bytes
SHA-256: e3050b59a32fe7c4848cdd37ba8db713c3fbc313f61ff7dcada20e9d296df9dc
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 17464 bytes
SHA-256: 48bb5905c2c1e7715f11c21855d586e63cf8478929781c8ee9f64738e5f77f7e

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