Malicious PDF — malware analysis report

Static analysis result for SHA-256 3801521f1817a36c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 09:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 394db64a4830798687fa0c53e0ff0501 SHA-1: 6aa9e8a9b3fd7185c07b4bc79cbc9366564395f0 SHA-256: 3801521f1817a36c4c070f4bf16e2ccf518bcdc1d7adae8d28cf25588c44b280
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to redirect users to potentially malicious or phishing sites. The embedded JavaScript likely facilitates these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=how+to+download+gta+vice+city+free+for+android PDF link annotation
    • https://begili.com/uploads/image/files/96896589307.pdfIn PDF document text
    • http://cpviettin.com/upload/files/79738732841.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/loxujap.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/75494716766.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9400a0b0a58e0bb66d6096cc97556bb4/vilazin.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wozagivifulu.pdfIn PDF document text
    • https://funke.be/data/file/nogebi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8a00f84---pipalajitajuvi.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/toladurenokupekile.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6136a907d797b.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/882bdfec94befaa9e0ca7b6f1768954a/zuserixapiwomesedokogux.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sujimotesuvipivope.pdfIn PDF document text
    • https://somogyplusz.hu/files/3928595594.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/44536864779.pdfIn PDF document text
    • https://jin-ji.com/upload/files/99213693033.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7fa5c3485a426d25de6b45a84b0c8d6f/59714761511.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b1b694d7---13961176416.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a141b7503464535efb69cc354667a4e7/60814377482.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/kanula.pdfIn PDF document text
    • https://arendic.cl/files/godigomejiporafuvap.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613df97747379---goxopijorelezofipisak.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/mopomuzufoxolixexo.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/10334552979.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_off0000b325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB325 14292 bytes
SHA-256: 060391ad109eb420999255404274d91bbc25e5d0ef2890861f7992e30c579c24
font_01_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 10740 bytes
SHA-256: ba1d328adaccc3a8bbb7353e3f712d6e492ef019641d674fae0257b2e618db7b
font_02_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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