Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef5d84f04c79fa…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 12:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cce6bdfc69d3fd8446d0f56fc1f3d32b SHA-1: c27b447917e41edab1a6158eb1558c12904d42ed SHA-256: 66ef5d84f04c79fae97147bed1a2ad58a7f16076b2a78cfc88377fddebd5f74f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of these links strongly implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://reparationmobile.net/userfiles/file/88410635798.pdf In PDF document text
    • https://funbugs.ie/files/file/62895377439.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c02276d392e---gamikokoxarawuwu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/28338341a881e7755e00c4ed136d38df/dexexuwezukatipujev.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/zaloderitax.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/69635975861.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210727_3693D9EC69E0F758.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/36064434198.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/kupagikezadunisuwafubip.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mugato.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/vowoxejedutenokutuvuwu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445f89146d---62788086759.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/doxunizokol.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a50a83dd---pamufapu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9h5eb8c4cdchjptqakuaulm0ds/matirazegaxiluvofobuditoj.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/gorixetubafupapejovadesi.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210607_68A45DC722A574F6.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/gazanonaxazatawutesor.pdfIn PDF document text
    • https://davaocarrental.com/images/file/42484559648.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de823193d8c---fufulububamivelabagidefi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u1mumndj2g8t5pdnm0hknsjoa2/tekumemukemom.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/637bc0ff556178186dbc7f6bd47315cb/62088169751.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/zavofuwufebixaxodol.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624686735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=traducir+fotos+de+ingles+a+espa%C3%B1ol+online+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 11064 bytes
SHA-256: 0c93291281cb2db1052c5f0ff6585896dbfd541a5d07a4e7dfd38e12203793d2
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16324 bytes
SHA-256: 4f2a9a26ae94a9e4f3ec726fc0ffc7e1e6ed9edd0c7cee3f16fc637664c46f3c
font_02_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 17368 bytes
SHA-256: cbb2002cc131ab66d3fcab91689270769c4fcbeedc23a7a46799690276a2b433

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