Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79c8696c77779fe…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 22:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7aefb54c2d38845e07665f93030fc728 SHA-1: 0193462ff874439eaa50f36b7a0dfd68977800f1 SHA-256: f79c8696c77779fe610867eeeabe0201dce41f4245b7b2ed95d42029f658eaa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=angulos+complementarios+y+suplementarios+1+eso+pdf PDF link annotation
    • https://pointvirgule.ca/upload/editor/file/pemefuribixomapof.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jifoso.pdfIn PDF document text
    • http://nfc.soo.jp/file/degufatileredimemod.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jogonesup.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-1/20210601215612557242.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/bexobekinepab.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/tovodasip.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/bajalomesaxutujatatopivit.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834522e6d72---78276998927.pdfIn PDF document text
    • https://msvadba.ru/files/file/guzuperevop.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/golom.pdfIn PDF document text
    • http://didula.com/img/file/60226080786.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f17c3177---19615022843.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609050e15b1ae---53635668134.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/remodoxumukeje.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/93936159717.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2e6cd408da2e3ca9717c4cfe56d94f05/67109147397.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/61066297021.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49839634013.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/lugut.pdfIn PDF document text
    • https://tckontrola.hr/files/39241763234.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/21037447408.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d95f9c321---lugimusiwajokevugate.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/jejulosajofarofazu.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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 16880 bytes
SHA-256: 9490c5a9852e162a8c6cf3da1b19b4dd86c499266c02ba5096aee0faada3d9cd
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 11208 bytes
SHA-256: 1bc2492abb67efc4fe869c37958db1ce825bf2ff1bf2f14f49c5bedc931ca9bc
font_02_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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