Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddcd9fe5f8f22a3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 13:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 760f783ae0829f9c802d56609d8e82d4 SHA-1: 064e003fb3b9d287d979bf1821a972e8c16ad201 SHA-256: dddcd9fe5f8f22a3be95821002f9bd9d0eb17e1a2ecaa3bcae6516a02e6f1821
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://innovad-ltd.com/userfiles/file/63498931477.pdf In PDF document text
    • https://beyondpins.com/calisma2/files/uploads/ruxoriwelujozu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d068b0dfe1---91537452863.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/vuwetisuxarobo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0fb16391---jatuzavi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/13138553111.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/lemunitubodujopugo.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/66667168356.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/3374520987.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cbae7405655---33826508624.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/juwabetadasitunofurobo.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/98488430823.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/03aaf0b8f391b3d46e3e0602a1e10660/68933640666.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021617129476444.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bb06a7c6---sibarepigufuruzufidopijig.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pegmus1lttvvb1d1rorh26i3b3/40160484223.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/787d35ljurqo7kes4jgtkr54j1/linasu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/22012d9fec2fa87862852b8b65283c42/jexipusufobufo.pdfIn PDF document text
    • https://intersat.lv/files/file/gabofaxowopepaz.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/sananejuxaxedowulan.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/27360479010.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/26844365419.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e090c72de2b51df1ebfc320a851149ee/wolavuxipimi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c126eb2b12---konejovapesewujowi.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/80e70034ba3fc6c01ac723164ac2b5da/57545860182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=simplifying+fractions+worksheet+5th+gradePDF 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_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 18148 bytes
SHA-256: a5d286c35e8d73a40a9b52f9aa584f3e831ce37eaea178857bf484e17aaa0a0a
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 11568 bytes
SHA-256: 801e632ad7b62517bea6d9c5dc35e2433daf227723a9cf0eb6a1270dc11c2484