Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5687948977282c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 01:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2c1af2c5cf3437bdc7e647b7f975783 SHA-1: 037ccea56d28c058b34f737c922887d9840abb2a SHA-256: 8c5687948977282cc9c3af5d5834464422445bf7867520212433812c42cdbdfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a2b0810ca9338b225c93eda5794000c6/xaxegodivowul.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e9c83397703fb0cfc4c69d3fb2097b37/39741445889.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/jigulos.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tafivujapo.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/15707088643.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea2e6f451---20767800988.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/30748713442.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073259f00bf2---xeboxotuwitusad.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xuxeludebolodu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a500dfc00cc---tazodizawumuxigivop.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/42598524889.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/huhmr9te0khiuk8ft4eo99dlb4/60077522184.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/76ebffdbabb5b4e533f3220094223093/xugalipelodinikon.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/godipizafebiba.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/gobizubobiganadakumamut.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/paxofawemosegato.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q5h7v06p34lq1fm10q1f40e425/50987057064.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/24909936486.pdfIn PDF document text
    • https://lemanssrl.it/file/86096643050.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/biroguzozigupad.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/tarebizoturosulumo.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/bikeb.pdfIn PDF document text
    • http://apsons.eu/files/file/89624740549.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e575723c3c2---40366845253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=excise+tax+return+formPDF 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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 17232 bytes
SHA-256: d10d48b05fa66584f6c2d6ba630813d40164fce6e149be30ace4b197b835ab4d
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 10636 bytes
SHA-256: c8cf35f64804cc80da46c254da7503b0284bd079f922cc8c3d31b09ad6a2b0d3
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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