Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f2ffcf871357dd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 00:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5899d714caca245a79d96845b69a9f08 SHA-1: 3fae974c6551acda7c78e5575b9c01570a05358a SHA-256: a4f2ffcf871357ddcdcd2255ebab7bb624f8bdad3848abfd1e0752c26dc45131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://catamma.ru/uplcv?utm_term=calendario+2019+colombia+festivos+pdf PDF link annotation
    • https://menu2uplus.com/images/file/90882775900.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/22061823425.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/35678310657.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c013930f0d---zawulefetopuf.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/14376374880.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/75791776418.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9b4ac92881fa38bee4ed2832cf64efaf/88355076648.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bimuxugenanatuwojelope.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/lixogofelukaliwimikosib.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cd9f077e---rawopozi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/67295591a8b02dbcab0155f380330d9d/papovef.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/25309231193.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/gepazuruguwido.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/musexurazodun.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/523ebaafd994a1cce8a0de88c2093782/81329102278.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/rufunewitomuworetadizu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cda9332f7---mefofofebokadute.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/7156238916.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/gaferorilibenebavu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609212f1ef938---wawudurudas.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dususixobigaguwodalemi.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/pivevupajofowepitidebegim.pdfIn PDF document text
    • https://bataretak.com/img/files/file/43497279899.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/xanimepuzis.pdfIn PDF document text
    • https://paperland.bg/uploads/file/bowikofisefosixifiru.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3479cd597---ravugetanabadasefek.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/601e53bd3a4d2c285378f7485e72c4ab/zumetunu.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_off0000c2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 17636 bytes
SHA-256: b9a82da205998da6cb64b9d528a1842351f2702e12acabfb2ce3c3a9b91b70c0
font_02_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 11480 bytes
SHA-256: 3c014c6488368d2715e33d7e4a32133685eb9ebfda326ed706eeebca1140a3ca

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