Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a20ba6c4460b77c…

MALICIOUS

PDF

98.8 KB Created: 2021-09-06 01:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98f274195b436f492019e5579642f807 SHA-1: 6c1b6f3c792e84fe9709fd189315f44386cebf95 SHA-256: 7a20ba6c4460b77c301b33889b6d18da25a5c7f6fc654618a3686f4054a2fa32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/190d395b38b924c5a3ac2545436de647/keled.pdf In PDF document text
    • https://aokman-drive.com/d/files/zifamosagazutokumubolur.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jolesiturinuf.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/81177236187.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120659ada11e---61054119736.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/guvexodexesimifa.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/94965137305.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/744495435.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/lekulofeseloba.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/roveroxef.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d85e8205---90434072359.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jdvukuqf1g1t35dhi1mr14jmj7/89476100201.pdfIn PDF document text
    • https://digireg.cn/upload/nodekixekumewi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784b7e60e57---7853999250.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/80808609346.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/61086422910.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b331655c2ef---jamupalasonelipozobupivov.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/lepuxasimetuwikusikawup.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/59912803735.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a3297f002cf9fec6f452d06aaa925a6b/29199144593.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8663ea7dc49e309240ea584e90cdf/81293266013.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/59266451055.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/17729033426.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xajusodofesava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=advanced+instruments+micro+osmometer+3300+manualPDF link annotation
    • https://mediaget.com/userfiles/files/paligosijikutiranudafefu.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_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 20636 bytes
SHA-256: 158b5cf924c1c301ab7bf86cf1a5aa18784fb3c3c24abc22ded9f3a2ce3e67e3
font_01_sfnt_off00014bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAB 10972 bytes
SHA-256: b03d02d1320988c944cf5f0d896423d61f026980aa400598660172efced864bc
font_02_sfnt_off0001653c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1