Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9c38b21e84184c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 05:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be4091be48f2d3906dcb95d64cd2370d SHA-1: 325345a852281299630b713b851dc24ba17f6add SHA-256: 3c9c38b21e84184ca430b697f1e2dc0789f759da7516d96afb51af62368085d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=all+gta+san+andreas+cheats+pc+pdf PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo57v4tg7c6taqpn2o9l8786d5/bopapunepeva.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f102bee12e---leludusunowamilajepom.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e423c47f---jijifujixovep.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb5d87b6ba---dupazujozuwazuxiwap.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/19641720861.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fefuxok.pdfIn PDF document text
    • https://davnosti.ru/upload/giwikirusu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/xatedat.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/tarurogewukap.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b08ea79d3---16732927418.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/vegafirifiraretu.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/73345682974.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/np2bn7n5irk2vap4op4pskvkuc/80268832170.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/7067625911.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6e3897dc6431faa6f9bcbb7c54a9cc22/jigiguza.pdfIn PDF document text
    • http://huiking.cn/uploads/file/231700049531.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/zozolexibijagitas.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/93385956904.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/34079097024.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f3f82883---vebanajafuxafez.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/33da2bd3dc2496b46d962eb60de1c72b/30996138106.pdfIn PDF document text
    • https://nistd.in/userfiles/file/15945147811.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4d624b64---jevofatubofukolixa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483354d6ad---63330962244.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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 10668 bytes
SHA-256: 44866116fd851379dcffa7419be1a2f07efd1b03eb4792a88a3ab86594431d1a
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 18032 bytes
SHA-256: 2f75c98dcffe613013e464f43c7daa6e7ea862cc82dff06becef24e73a769e72

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