Malicious PDF — malware analysis report

Static analysis result for SHA-256 867700d21e20a081…

MALICIOUS

PDF

93.8 KB Created: 2021-09-09 06:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad294ceaecf82ee5b6c0a7fe57b4ba1e SHA-1: 6a473baf3fe5b8186e11a9a236f8cd3f63641104 SHA-256: 867700d21e20a081bdc4c92f18edd9e8834dab54d07389286db77232d25bb286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to lure users to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=adobe+photoshop+cc+2017+serial+number PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/73sggbm14vak67edh6i5u0ni04/gusafulabago.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/57442213546.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/43036870128.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/suzibijogegomizivozusefe.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/pokabelefuzatu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dead9196---nafevebanowewovezoxabulun.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///69599170028.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210901_D0D1B056E0718A14.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/laxugan.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/22158040601.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/vovesexenalizorusinugew.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nutumaxonasedaladavusem.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161363bc5641ca---posavojufujutajafuweki.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3606_20210907131545.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/mufamukureresuw.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/12622758410.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/diniribexuwebukesoner.pdfIn PDF document text
    • https://linker.tw/files/10705676872.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9a2756abacda37b6b11db70ecb651a31/dotebuwatokulebuxejidaweg.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jekoxoduk.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/siragabububozat.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_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 11344 bytes
SHA-256: 45c5eb5dba2d7b406bf1d8bf2aab8a0697431b6fc6744e58d0a9848638a17c2f
font_02_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 18944 bytes
SHA-256: a8837446aa75705bc389f4772b6f3eaa7d6e57a0415f1cae54d6862bc6055b82