Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f281931a6fb111…

MALICIOUS

PDF

91.3 KB Created: 2021-08-03 22:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5aeb8ce4c4bbae16b9ee563646522210 SHA-1: cec1124f6c240dc8a165332c937b635c73f49a9d SHA-256: 12f281931a6fb111b35c2b5af996e0ec5a7936d7e4b01351caec89a698c1f807
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish for credentials. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://firegallery.ru/img/upload/wibuvedobutejusute.pdf In PDF document text
    • http://langfordfinancialservices.com/userfiles/files/1286628262.pdfIn PDF document text
    • http://freeski.hu/freeski/file/kududefisuvimokevatul.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/78497932544.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/19462270522.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/kewefavurow.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210630042244.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/45251975197.pdfIn PDF document text
    • https://dhesient.com/media/webololuvasiwa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/bibugatunoke.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c13a58b5---nigovafe.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c640db9d05f0747e6ad07b669bc762f4/xewupuvexosinerepu.pdfIn PDF document text
    • https://olterus.net/contents//files/68043240367.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/komunuxirivabunibaga.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ff12dd27---gezujenonadimovekagoz.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tcb01alhql97r4d620rdp8lgr7/razuwasa.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/99216881605.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1594873d212d146b607a3079de67e600/46398694684.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cab987b2b3ca24b8069a19285e79debd/kinusorijisi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/56751048351.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd261beea---63037283157.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/bepepenafarepikavelozewuf.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/70739519721.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wifexorap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cours+d%27anglais+niveau+debutant+pdfPDF 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_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 11044 bytes
SHA-256: cd07b1e3565af9a14f6accd5c6b7a056eca60fdb5cefa2aa5628fc6878903b7f
font_01_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 18848 bytes
SHA-256: b48b0b1cc11ae030b641e49ec97ee8c89a0432c3bd8f658daf0f609673392c8d
font_02_sfnt_off000145c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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