Malicious PDF — malware analysis report

Static analysis result for SHA-256 e480f2dcb56a6ad5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d445f859c271717bb015699c5559461c SHA-1: 8ae62595f3e011985d95be827e651e62338bfb27 SHA-256: e480f2dcb56a6ad59fc4563246232e3fee860674645d2c5cd90af4392093bfe9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. This suggests an attempt to disguise malicious redirects or host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://metabolitplus.ru/files/file/koxetag.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35f0d8fdc---33003891688.pdfIn PDF document text
    • https://wineart.online/userfiles/file/15060945297.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90683146069.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/18648862692.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905133847.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141ebf0c985d---rutisagipibozeduno.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/wolonerozirelubonil.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01a1eee2348b3f25ea8d4d453cdb7719/kifin.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/zaguniv.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/20676128349.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/tukejirezepukekox.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614406dc5c6b2---59082243974.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/69102512132.pdfIn PDF document text
    • http://centronegozi.com/public/17468571593.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/27387657349.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/97846870223.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a210037bfe20731709b1b752da81c9a4/10359150881.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/27091038022.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631391155.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xunifexat.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6bdc19bf---18569128465.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/papaxawadamazuxiroj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161382a6d8af48---71816021716.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/vaxab.pdfIn PDF document text
    • http://classtool.info/upload/files/39535073102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mmorpg+games+android+2020PDF 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_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 17936 bytes
SHA-256: 8548f704eec680e0811d43874799f592d0ebb3872da96dcbb6c612c63b0fb890
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 10828 bytes
SHA-256: 2ff698cc608ea92c98230561b488e566b0b131f4bfc06ceac129737fd5ed5440

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