Malicious PDF — malware analysis report

Static analysis result for SHA-256 346d6a4bbd5ae0b2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 09:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efd9e2cc576e001b5288c78dd092c793 SHA-1: 4b8a664b5e15584db35e9b0fb21c8ac6b61bdcb0 SHA-256: 346d6a4bbd5ae0b2c3e1e6cdab6b0ce94d0bdc7be81ace9e2c0763c3f23fa228
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=powerpoint+chrome+os PDF link annotation
    • https://ajur.rest/uploads/userfiles/file/xawiwenibekolema.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/81119913540.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/71280714593.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/62997094037.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a466f1ff18c981f323d6c07e881e6b5f/wobifapavusuxudokudifafu.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109080023257790.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/tuzade.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/punufasejutixonoso.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/lakoxazanutegivotisukuziv.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/856ce3e39984900b39f5e95916bec6cd/mifesofolamegenaxevepemob.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/kozoloxopox.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/kisemafu.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/fujodubafavibulazesekavu.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/27092485411.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/sunekafefixusare.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/88606800529.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cbabc157---manafebelebezazogoxuv.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/paloro.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109071813139093.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/94851453032.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371e1a1a2ac---45005541594.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/31353643033.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/serexodedepukaxovetax.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/tovuwuzijimipiwugifaz.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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10516 bytes
SHA-256: d87ce55a58d82c766b98a637acc823388fca1cda3ac056c3595d729d638e1ab1
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 17504 bytes
SHA-256: 3b4d6640bd84285d30353bdf10cf57561b6db9b1a9d93bddff3cf2267fbe1dbc

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