Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccc566831059c3d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 17:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0866d3a0a23c6a289c0334c74ff071d1 SHA-1: b82afde38336ceb27d1ecf93d46fcc255a724778 SHA-256: eccc566831059c3d56b5bfa49188c7cf1901180a045d352f3ce2784e3de46cd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fsgzb.com/upfolder/e/files/20210723182545.pdf In PDF document text
    • https://fallsplat.se/file/depuxuwamirip.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160718ad43a4bb---23051357810.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6630a434b---18722033332.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qf9uerko9364dj5etnafmdlr89/81408629011.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9dfb9fce4---tijolut.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/zenejunerabobaxulivu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/62305372278.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd665a0798c---11658010523.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/774948fec6eabf8f52120bb9f526ced9/53172700641.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a47037c34---630045941.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/38417780686.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/jawogorobituzokisusir.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0dc532d9cc4ff08095f842cd62ef0b8c/wipari.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622286387.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///madumifawenezitojan.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210727180426.pdfIn PDF document text
    • http://altus.pl/userfiles/file/modil.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1715329362.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/salanukasisineterit.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/dl9pu56qvvv0edvd1teff2fvev/zikawatumer.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/97433179337.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/40708893885.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/47736144825.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bf7269169b40e996d4f07cf524049ee8/pozakigifegunaduf.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/36214418662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cara+membuat+cv+dengan+format+pdfPDF 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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 10996 bytes
SHA-256: d4162026911f2bb03449778039c9ca829efd4a83b8f58dca910a394e0ea5d1e7
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 17232 bytes
SHA-256: 774c305a34a3fa9511f2b165f56955c7ea4961aeec5f408632bf4fd5148454d0
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1