Malicious PDF — malware analysis report

Static analysis result for SHA-256 520cab9f708fe68b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 02:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b31a1e6b30df96159729eef79b2736ff SHA-1: 1ad3b04ccace140541f6551171b54bf0d1ad228f SHA-256: 520cab9f708fe68b825175712d538180421e8032674618ccd22afadde937ee76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=pdf+converter+app+for+windows+7 PDF link annotation
    • http://christopherspubandgrille.com/userfiles/files/46566685502.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe15e8c3c---68354492332.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612eade82aca3---lesokopifukinonuwo.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zogidenareguresuxej.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210916020448.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/41376614975.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/beriwod.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/23150200313.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/20695543044.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/natadatusutewafitavurubam.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/notibapapapidumuxijato.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/69391463637.pdfIn PDF document text
    • https://reha.bg/content/upload/file/90328017260.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161429b0d7f10d---dewepisuzezofazenadi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729d425823---vavuvavis.pdfIn PDF document text
    • http://dasbluemchen.com/vovadexerufezetipun.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/83464969038.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/maligoxe.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vinurewaru.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/gizepelavaxopav.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/nefotozufinexo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9dd58ce155911a489d316b509712cc87/90134517919.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xamesizoneruwebe.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/ruraletigalu.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_off0000c144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 16756 bytes
SHA-256: e038d1da6712b403d3b1e9bba7a72493d8c8613d30e6b7bcca8f6432f776560f
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10772 bytes
SHA-256: 76e6c982ec057640a355936adc35b8070c3aded0abf7e01b40b97e13a0749a41
font_02_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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