Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d89edef62ff10c…

MALICIOUS

PDF

88.0 KB Created: 2021-08-10 23:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1b1f2b870b28f7160e1eda3f548d795 SHA-1: a18b456bc567980e26c9bfafc8b5b806eae0512d SHA-256: 45d89edef62ff10c43e3c0a8787a0de6f03bd4fd48a7bfcf5f05c84881e0df0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/auuqk7d588qi5ipu43a7k7ssur/godoladofo.pdf In PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/6453a2a91a1ae384729767c32acf4ab6/78539204061.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/woxude.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/wejuxobosuvodibexege.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d51de77257f---zuwero.pdfIn PDF document text
    • http://yuha.be/_files/file/15748905389.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4d75eafc8d230afc6a8246cc490ae69b/mejorimij.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/gorifedotixelavij.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/89439733482.pdfIn PDF document text
    • https://cmoretv.com/userfiles/43569649975.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0re43bhdkf77r1hi1tj32jhdkh/52453139851.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/gejadivuxikupawuwuzokubi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe1037beb7---pepijejarifivakidev.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/62063410099.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dc7fe67258694d40a444729e7c31f853/tojaluden.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/95817807517.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/61309115626.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/vijekiletabip.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zigukaxudixime.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/tovezum.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828958ab75c---84248206055.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/zujevipepopagegazatipa.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/70898513133.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/148e9da4339247cf1ac9d77e07b47de9/sodefudodegemape.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/43634399780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=captain+tsubasa+ps4+gameplay+espa%C3%B1olPDF 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_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 17524 bytes
SHA-256: 451fa7d20bb5045c0128da0e60d6c09caca1d41d36bade2c256b9a038799f968
font_01_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355F 11164 bytes
SHA-256: 518cba24e61be6f757e6522884eee3f6991d671ea220f66a21751eb9c7692ece