Malicious PDF — malware analysis report

Static analysis result for SHA-256 7118bc8d3d0821c0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 10:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85797e3b92c9c348aadb41fd2756b788 SHA-1: 5a7d69ed89d5aa4b8df0ffe2c6167e62a0b327aa SHA-256: 7118bc8d3d0821c017df394b3a78479a96d71f3965a293b5dc425b76a283ea13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites and serve further malicious PDF files. The primary goal appears to be to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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=tensura+king+of+monster+ios PDF link annotation
    • http://scouttautomotive.com/editor_uploads/system/files/refajuvojulesif.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614513313aac4---mefonadajunawepiti.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/75976735419.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/lanaruridujererefunem.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/75213913484.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413af7eb659---57270305228.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/mawofuzavug.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/95548922704.pdfIn PDF document text
    • https://unosms.us/userfiles/file/63211014860.pdfIn PDF document text
    • http://gptools.net/userfiles/file/99740932817.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/vijivapidezopibinegoxexaf.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d07fdbd5ccc29da35d71f38ae2a9d106/neruvogixemavilenabore.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/8915816685.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/18065041466.pdfIn PDF document text
    • http://anindecor.pl/files/file/15557788778.pdfIn PDF document text
    • https://castel.ro/userfiles/file/87301421434.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313875ca250---20755916327.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7ab3d404fba1b0ba74d422c3306b9f7e/81617221368.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/70068805086.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9672b466---verowopefodowururu.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/gisewisu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d8833cdbaad560848487f0ec95403eeb/60107551128.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/84544156604.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/zumipogufe.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/14787340166.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/jigenilewefot.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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 10668 bytes
SHA-256: f4ae7b2cc3922881d414b72e9f86265099c3ebec21e078b02f73159c0210e73d
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 21052 bytes
SHA-256: f7b9935af4eb479e316d3b4c823c83bf06f0d143e3ed786b7270636c940029f0
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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