Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5bd1341cbe7153…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 07:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5fbb0acba423b1f0f660570359b560c SHA-1: 6625a940074164d66c23ff0e6981f5a65df77159 SHA-256: ee5bd1341cbe71539cd00ce960550773c76a7f062f5d901d5627ad4584ecb018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The presence of a link farm heuristic and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing pages or download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pixomot.ru/uplcv?utm_term=how+to+retrieve+text+messages+android PDF link annotation
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xeboxux.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/darufodazoxumewitiwo.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/55514120198.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d0299c8d---10551520485.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/24139146886.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgnkb9ec1f24heo3s4mip1knv/bogeno.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/94612853315.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/48456332837.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/53133581970.pdfIn PDF document text
    • http://cloverdiamond.com/file/82406120258.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/selewus.pdfIn PDF document text
    • http://tfforming.ru/d/files/46881851873.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6f479fdf---674591879.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fanukuboxuvegarodirezafan.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/mikemozavexawaj.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f790a258a55548ac69e428bce259c9bb/nonitem.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/viwosobukubofusiwuw.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161387028cd8b5---tirunejavatoratorikikir.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/zudatovaloxedetetew.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/55851620306.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/pekogonukofipipekeze.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/47017024464.pdfIn PDF document text
    • http://orem.mn/uploads/files/6630021333.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_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 10788 bytes
SHA-256: 3fb532a2ce689b0fad8025a7854e63387f6eaca4a2e0403c6cf07c700d257d3a
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 17796 bytes
SHA-256: 531fcbc62563f16870db46c31aae074d37fafdcd7251048490565eb41c6eaaac

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