Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfd8f70dfca1fb3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-24 03:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 43bcf50e4566c31e16cdca26748c27ef SHA-1: 5c2f6d3689a8dc8353c6252ea87cc9bdb6e40a9e SHA-256: dcfd8f70dfca1fb3300dbaad98dfc72693e26509a185738650db59b57477a5fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to external URLs hosted on potentially compromised or disposable domains. These links suggest a phishing or malware distribution attempt, likely leveraging the PDF format to disguise malicious content or redirect users to harmful sites. No scripts were extracted, but the presence of multiple suspicious URLs indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=palo+kimbisa+pdf PDF link annotation
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/6185234550.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/93718396548.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/6250999338.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/23/file/20210923_034652_169.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/30920937057.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88614721848.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/62726333054.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fowedapagumidurixotowoza.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o8ibgfk4gjjj1momb2n4aj3snf/dunoxovupunodumos.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27dabf3f0---96515413580.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090911591573499.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/78330504741.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/52382211027.pdfIn PDF document text
    • http://zamgph.com/uploads/file/072243042858.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/dikisunavamawisilekozuf.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/59828559954.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/35978765827.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/gobev.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/11230036570.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/gamafisevidari.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/9179222832.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/63170596423.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/jasavuvodinulofabumifuw.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/63019223471.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wepikorulonulasujunoratik.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0be996973101e48dee13f2102e8de595/53513860144.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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10460 bytes
SHA-256: d4f5251d2d70ba1321bc0859b2a98615f36e3c5b8544afbbda8297e4c4352272
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 18636 bytes
SHA-256: b0e916b0ccf8f9dde41c82cd4afcd6247622a6bef16e3f053053e5a9180df092

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