Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5a87bff3f68f1b…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 19:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9baaf1cd04cec9fdac9572bd5f059153 SHA-1: 101ca81aff223caaa27599fbb316cb2e9029f43c SHA-256: da5a87bff3f68f1b1a1bc69f31649159523afa09ea3514128e298bf981ccb460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=tic+tac+toe+for+android PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f7794fe972ee93204b4f45f88286ff43/nesemoje.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-21/images/files/47213526157.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/74448381742.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/38445536601.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/nijuvokonetonamoru.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gulog.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/21212777843.pdfIn PDF document text
    • http://1carl.com/userfiles/file/ligudujobizuseboforu.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-24/20210924062629657053.pdfIn PDF document text
    • http://japhina.com/upload/file/5699752510.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kigizukekofobasatuwunepuk.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vagijumatexogubadelupa.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/niwejavona.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/tanevewurimifuganuw.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-27/20210927142257462853.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/56127524414.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/fedijogovepojetobusijidub.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdaf6c4fa4---90197738109.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/33577619158.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/resomukabirefegawiki.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/ruzobopogakakikozepefon.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pawepirosefat.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614e47ae2be4d---9700060432.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/diporapofuxorobegefe.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/36158761761.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/49154954894.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210913234839.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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 10216 bytes
SHA-256: 110006c26440cca2260fe325735086c2f450d2c6c853057b87d2a59e365d0e21
font_01_sfnt_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 17980 bytes
SHA-256: 99a9bd168d49e36b593806a0ea76b5b0ece5bee1037126ec24fb06253d81698f
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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