Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ef97b2c3833cc6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 10:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62957f445b25959f06811fc8cd1b1c5d SHA-1: 5d32e4b8efc8a2d0a13eb2dc5fb8292074a29272 SHA-256: 59ef97b2c3833cc6e8b00a252402815f3a160a54b83ff454cb41969b91b5a898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and links to PDF files hosted on compromised WordPress sites and other disposable hosting. These links likely serve as a lure to download further malicious content, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=friv+old+one PDF link annotation
    • http://bubb.cn/up_file/file/memamirix.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/23466671660.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/19073317095.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wonutukikizetozigoseb.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/xejugudedelotiwefow.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caf61c5bda3012ee961b693b2eb559a9/8533429001.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/78989725610.pdfIn PDF document text
    • https://service-panev.com/userfiles/lofijoxenirozafuwimifew.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/24065987176.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/kikorawowexir.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/84248101554.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/zoxurokowawesivu.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/mevaf.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zotixavaveloxodewesepe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/68da6b7ab3ffc6f538fa0511998e855e/rapifin.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/55741894081.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/tifovona.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vigiledid.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/72716243208.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b199a7ca0---67235209159.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/garorodiwutuliku.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pi4v5bfcl1algc2o0e3k25d6p3/luvopowu.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/bixewuzer.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/86113450946.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/zebik.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_off0000bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 16904 bytes
SHA-256: 849d0011372ef140f3e957e3fbc6f3744a7bfdc0d0722cacb9534a7f0a817980
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 9856 bytes
SHA-256: 8e3e4bc35251cde44717909cee8eeb6e8532643c861263e6dc6e1f25cf0c3022
font_02_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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