Malicious PDF — malware analysis report

Static analysis result for SHA-256 f709747fb396ea5a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 13:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 246720b2414f9e16c583e495ec0ba050 SHA-1: 64023f3c2e7b6910f0311c4c0c357432f8071cf2 SHA-256: f709747fb396ea5a60ba62b264c08ee7c49bd5e77b9671a4c2cc5fbfafc513e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users into downloading further payloads or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161106bef5e45f---bezusuziwuzaxin.pdf In PDF document text
    • https://argekaucuk.com/nbg/upload/files/19210442491.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fowokomatebawaletege.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/2483072348.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1ba2945415bdce95cdae8c53398ab509/69883627055.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d32598c11d2---35200992990.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd8e3d280---pavodexamilixebot.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f49882ec60dfb48ebb0937c6c51ebcf1/wekerikex.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/vivin.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2c4915145c487685025b9e252c2e470e/56929093995.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/80578010156.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/eea249ec03740cb8917d1acd8232b807/lekujexovewe.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/volojiwalo.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/82422024025.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3314ff09a6d713cff632a04fee6efe1d/77628983865.pdfIn PDF document text
    • http://emannsltd.com/userfiles/fakelanabugaluxejejufu.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/vapimikevuju.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8f292873426e66d8071fd178f3e885ee/muwid.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb104b55cb1---rejuwazuxetivutixitoxo.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/6364903779.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/duwusubaxir.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-10/20210810075432619042.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bb419c5b2---lumubukafibufixur.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/29724757838.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/86393590485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=elements+compounds+and+mixtures+worksheet+ks3PDF 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_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 17388 bytes
SHA-256: 82342f12751647cb1bd225e6a562280f89419603a9fca0379b483ae4c213ecb3
font_01_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 11316 bytes
SHA-256: ec61f6ff99377633f07510cd460db5b1b95bffce3493c201ae1d1a3897b8c3a7

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