Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9747481a8e7d819…

MALICIOUS

PDF

122.6 KB Created: 2021-09-02 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df08b5e074b1537007b19009567d7328 SHA-1: c926109dd49e5167a220af4385f4813a7862d7d1 SHA-256: a9747481a8e7d819c593e5a1bcb14acb9f870c2d531b462b66cabd64ce9be559
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to compromised websites and disposable hosting, indicating it functions as a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://daedukgs.com/admin/fckeditor/data/file/20210630221337.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c46a35019d02a992f1b89c4522c65f5e/zozivitosetaziwara.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c05a68315e6f7d8ad181afc84f86ac56/diroben.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8031d649---46078489771.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jlntv53jrstuqvh44t3kd6lhk3/vusikajalemoduwi.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/fakexotubeluve.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd62d57d3---5682148450.pdfIn PDF document text
    • https://777mto.org/contents//files/tigipoxamo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fusejajef.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/09e9e488fd84514bb820e579ab3ded95/jimoses.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1d07fa51---nimititogiwodosomeniri.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/62079905444.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/firavadurebusela.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tigbmndd9af9pljdgc7qnbru8j/jisilasipuv.pdfIn PDF document text
    • https://forssh.com/userfiles/file/vosununigabatif.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ncrblu9o645sk97l218ama8bs2/jijifiviwugivejikakepivo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7306c05dfe---lidivudibokimedufisenoref.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/farigafifisatujotenes.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/buvajamobaxanatudoparas.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/26337730755.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f5c1467a4---81106761269.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c4eeb7ee5d89af8a865d744ed0d3ab8e/30988167834.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/sulamofifanofamafemi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jezimamepakiwixipoxidiv.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/sulumelafoxasu.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/xemubaniponu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=carrier+air+cooled+chillers+manualPDF link annotation
    • 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_off00017ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001980e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1980E 16556 bytes
SHA-256: 2a2707b5e43fa2d0acccb41747874d02d3ea4a87a50f2ffe8f8983fa6e9ef339
font_02_sfnt_off0001c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C31A 10668 bytes
SHA-256: b8cac22bbf490b5a05e1d6c92b7567aaf9604fe72a51ac21077764f45bc5d080

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