Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8b9592515caf35…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 16:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff9845eca8895bc835bacfd5ef72aa9a SHA-1: ae750004f7129b90956b20240ce3ca8df82cfbab SHA-256: 9e8b9592515caf3554dd68da60da3f95feddd5a5885b424c148c9b86ba6dd9cd
196 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains multiple URLs hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to execute commands, a common tactic for downloading and running further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crysiq.ru/uplcv?utm_term=how+to+take+a+photo+on+macbook+pro
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addbb2e1f15---39403956895.pdf
    • http://orlickachata.cz/files/files/favifomejixaniv.pdf
    • https://fwullong.com/upfiles/editor/files/renoburozalufuzomu.pdf
    • http://files.ibiza-ferien.de/file/linifiz.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cb923c2fe---75812556339.pdf
    • http://barksdalereunions.com/clients/869108/File/bebotemafopuvulapevux.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d0af8285c62d4ba83374a022cd3774d0/88688251866.pdf
    • http://doks-films.com/pcms/content/file/fevalageroligowutu.pdf
    • https://firesystem.ro/imagini_ws/36247719930.pdf
    • https://agrimal.pl/userfiles/file/sapekunebinifipadawusivis.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad0274d73---43330940989.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/47768706415.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ebb2b028bb4d93f188f164a95399cf38/zalekizerizisinexova.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910eb7e5ec8---gujajof.pdf
    • http://asfalon.com/__files/file/danixulusenego.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2168f4f8db---54052926875.pdf
    • https://euroroma-bg.org/files/file/gadarigozazetil.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/dhot40m1o8cloh8fkqj7glgp8p/luzupufi.pdf
    • http://newo.ru/files/files/37606442852.pdf
    • http://baocaosuhoatoc.com/luutru/files/54093921711.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a14f640b1ee---75261216801.pdf
    • http://messtores.ca/fck_user_files/file/47904497479.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8230af50---1839784476.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16792 bytes
font_01_sfnt_off00010453.bin
2d00328208eab22bf20fdc421d81475d32a010ec7073f2b2dbe76dab54624a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 17508 bytes
font_02_sfnt_off000131c3.bin
31f814a3a56958170f8627c11186cce3d7c0483d04d8be3efb018a5f707d993a
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 10644 bytes