Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a1cbf1b5f18b46…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 12:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 703fc45c5c23f40afa9fb2899f0dd557 SHA-1: 7447a8517a4236e3c41c84cc396a7aa45f01d9af SHA-256: 28a1cbf1b5f18b46a974816624de2cf353e342059e227bee77e68e69dd533bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms and UTM parameters suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=tiger+woods+ball+position PDF link annotation
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/08ecf76b32af8bf751aa8086ebeb4b9c/xazitaxedu.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/wegisinubigogubasoneb.pdfIn PDF document text
    • https://songhong.info/userfiles/file/kutogamibutedaxuguzip.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/zanuxupaz.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/pupuvoxobi.pdfIn PDF document text
    • https://adikkedua.com/contents/files/barijixamutuloxidifulolo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613da519f38d0---54389375332.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/pezuzow.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/94615508083.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/96556931209.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3c9410490e92fe08301bce0c709330e8/sunib.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/71625015146.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/67919011547.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/e1jl8c56m3b9g0n9ubkt6oqj44/83993319151.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98bec1dd6---ribudodatapizudaxak.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/rodirivojumuzobak.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/79995476401.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/1355984252.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/xorepi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/fe53e71f82464fc06d3e1958c13d6888/fusijejamo.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/63532655072.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/gemorexedetavosamege.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/52370115885.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/karadapukoloselajomit.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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 10756 bytes
SHA-256: 530295212b31b48ffbaea771f6042f6cb7d9f6c6f03b6d490f9d5a247f8de3db
font_01_sfnt_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 14984 bytes
SHA-256: 174162736da6cef10e8b5a392b214401b0d08c3776ca6e75312b9701a05a8a04
font_02_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1