Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec201eb261bf67e3…

MALICIOUS

PDF

93.5 KB Created: 2021-09-20 04:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2b7c7dd32d2cb4dcde05bc2eaacdb8f SHA-1: d252a033f6c6402ad565715ed39aca34cae15bc9 SHA-256: ec201eb261bf67e3539dc8f2e4e543cddb9b61d1a93c10187b57a87754ba61c6
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic findings point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://icareonline.net.au/ckfinder/icare/files/domobebejodutasowotob.pdf In PDF document text
    • http://phrabat.net/UserFiles/File/xofosiribumujanodesede.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/18232021103.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/69241672837.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/5985418863.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/59985690995.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/25876829078.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/16461700890.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/97c503aa54a3909ec32fae0544012fb3/lanotajizerolarimer.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/23348171375.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/strg6b6u7roi21fhuktrft94q2/68885673423.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630594641.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f039fb7d87---virelorepojurepaj.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kojodoxufitowu.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/16298748819.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/830d41714ea72b715fd2902c985d08e2/jusebeju.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/39121773668.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/98981258622.pdfIn PDF document text
    • https://12waktu.com/contents/files/litopubenoradewubujugafix.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/gipudavojijafovomefeku.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/14941682511.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/69156409593.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/napuxarutozubadadozem.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/sudinulufifegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+offline+anime+gamesPDF 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_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 17388 bytes
SHA-256: 09f4c703818e9b52d6a0e7107d193393080cf7eb1fd933ea90e12cbbbfebea6e
font_01_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 10512 bytes
SHA-256: f13aae112174b3703692bbe9f1bcca63dd0bfa4d8d3bf1e9a483b6a3a771ad50
font_02_sfnt_off0001506d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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