Malicious PDF — malware analysis report

Static analysis result for SHA-256 873d051c9f9c1533…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 18:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07b3113bc9f823c6f42245757ae9e4b9 SHA-1: f01835a701ebdcd775adac20296372aae1ed714e SHA-256: 873d051c9f9c1533bd684b055ce10fb9f93778200d58cdfc95f4b1d79de44bb4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=roohi+movie+watch+online+filmyzilla PDF link annotation
    • http://daimarconstrucciones.com/images/admin/file/49958524660.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316fb86b8d9---82785995633.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396930bf999---82068484747.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/9022556218.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/97732376089.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ab820c4---femupugebidozedituvilusiz.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/74325092420.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/biwelumubini.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/mefeguvugusexumapixite.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/pimemivanoxutilelofix.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/20152800181.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/5179770440.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219132057408528.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/8444678692.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/repasijuzo.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/puselumab.pdfIn PDF document text
    • http://word.mn/uploads/assets/wuwuzalomiwavodigova.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xukitudusamesudogumet.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/bipufopemi.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kogokejujijota.pdfIn PDF document text
    • http://www.heksan.com.pl/file/7170503019.pdfIn PDF document text
    • http://synphabase.ch/upload/file/dopok.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/81081773001.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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 10704 bytes
SHA-256: d10217fdcb4b76c3839b1d26164d251830ec758db4d92a436e8cae00fd7563be
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 18088 bytes
SHA-256: ddda0152eb7c4284bc63ce357260208c64ef90d4384112ee6d287a3a13a6bea0
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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