Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e1162bbaee852e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 09:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82ae1e31f5df281e55ba3f7f0d748ee4 SHA-1: d5284e9bd0a879e7250dd4cc0fea7879d2a42561 SHA-256: 93e1162bbaee852ee34326a16525e974cb44c4f981f2a87d3d2d2d2265a705dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The embedded links likely serve as a lure, potentially leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51d1c489e96d30ec54ea9bbfdbb83a3f/fajoximigonikopoxategoma.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e01e2487fd1fe031fec1fd18ed49e73a/3958358649.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/morexutabeduralafewe.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/xapadar.pdfIn PDF document text
    • https://dptech.vn/uploads/files/dazofokofibovepokoniwime.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mjatatk440tklhi2avej6daksl/zovat.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/tavebaloj.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608057f59749c---nemazupez.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/zupodofegopejen.pdfIn PDF document text
    • http://holzbau-napetschnig.at/7717368204.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c1f9cce358d1312842917ea36a0d43b3/87121185725.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e67dc4b89bda3bb88cc532cec7758c25/wifexijetowuduxa.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/gudajekegegojexivejaliw.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/18496a66299189550906deb5d9d14c58/23248964567.pdfIn PDF document text
    • http://korytnica.net/data/files/lizuwulopibebupa.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/lasekuxevipokazuwi.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/61740595346.pdfIn PDF document text
    • http://elm3rad.com/file/fegemujodoxew.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/44704941900.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332343df9---fabedatiruwomatul.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/98031604825.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efec47c8b5b7f69a1709f6af5c4c4478/13867639086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=staff+nurse+interview+questions+and+answersPDF 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_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 17736 bytes
SHA-256: 117a5cbba90dee912fcc9cdae116cf2edaca9a7bfe720da7ac23059f560cc8bf
font_02_sfnt_off00012d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 10772 bytes
SHA-256: a8940cfdb43674c10f0e25082c84fa1420ed29a81f266de84179ebce38084d89

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