Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ecb10c6eef5a0…

MALICIOUS

PDF

103.2 KB Created: 2021-08-24 23:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 64cec40c4cb06ee7bc3c30fadb559b81 SHA-1: bdbdaeccd5bf12a3090199175138ed0123bdd363 SHA-256: bc7ecb10c6eef5a09e5419c77843f56f97448993c2c749df65301e34e60b42da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=what+is+mf+assist+in+camera PDF link annotation
    • https://essaidafm.com/uploads/FCK_files/file/5662396670.pdfIn PDF document text
    • http://aven.su/userfiles/file/98839599326.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4893b4d6---rumenixofasubivupivebik.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/71039447595.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/kedijunujul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41048181f---lobop.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de6f96d37---8091992439.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/84642299693.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/56478d9e80e391279e26e9dd4cc3cae9/rilorokefujesobavapav.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/83752da1692300f51f819c8b894b4977/supugozipuganitasigex.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/juvuf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609272586400a---fupinokune.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c2eee35247d79ed8004a11d38fff6872/revofatikowoperi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eb328032dc66bfab9132ea82e3fa0496/jajupatewezow.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49437834ee---koxoruzosaxatuxajukilerop.pdfIn PDF document text
    • http://bamor.org/userfiles/file/39407945763.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ae1614cd60279224a04ee3f0de4356c7/81897225411.pdfIn PDF document text
    • https://go2germany.ru/files/file/97612986141.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c512769696---nasesumak.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/kimuresiditigagos.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad89e1637e---dejot.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/kusimozusadetudubozapele.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/xowabasovi.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_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 18140 bytes
SHA-256: 1ef30ee82d78b62b39377262abec5e63a99144e721c945568e262757e31b832d
font_01_sfnt_off00015ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC6 10428 bytes
SHA-256: 34ecbe630885afad2c913e46d46834395aa9792afa15953588bad4bc84c75057
font_02_sfnt_off0001763b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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