Malicious PDF — malware analysis report

Static analysis result for SHA-256 990b9c974930646f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 04:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 571477c892e83e317ec52df52ff170dc SHA-1: bad0eebc875c475dc23da4f7b6ce317f3d64c1d1 SHA-256: 990b9c974930646fef34eee80239b55971d021a07f890ab63cf8d07dbc53ac83
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Multiple heuristics point to the PDF being a link farm, with several URLs hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=excel+vba+print+to+pdf+and+save
    • http://mp-hd.de/data/aktualnosci_imgs/file/lopidojetumanikir.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/981091cc67e2ee7c9ab0bb4b8de6d08d/41819130830.pdf
    • https://actsonics.com/uploads/files/202109192233385964.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/susasulixakagorova.pdf
    • http://rebeccaosborne.com/uploads/73938751866.pdf
    • http://wohingltd.com/userfiles/47205517728.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/039aa4a4482a0ad0d0da69d2751536a2/baperurirenobexiwaw.pdf
    • https://kueapem.com/contents/files/vufisawejotop.pdf
    • http://donauwell.at/userfiles/file/30888028803.pdf
    • http://dblbtech.com/userfiles/file/kunixaruketud.pdf
    • https://rajatotogroup1.com/contents/files/29110343630.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/683a5229e9d7e66e6ddf54437cde052e/sexizinasetasaxixegelofo.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fuau6gihfkgd23dlg8a9cvgsvg/24570136006.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fixibomasakud.pdf
    • http://compow.net/ckfinder/userfiles/files/13093727166.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m20khmgsgecn8leeh8f92d3kvq/47650727852.pdf
    • http://smolninskayahotel.com/userfiles/file/sotegiliripugijalotu.pdf
    • http://canshu.dlzj.net/upload/files/20210903115538214491.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85184e8eb---1766171781.pdf
    • http://0vote.com/ckfinder/files/rakapijo.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/guvelolapaxijoxo.pdf
    • https://gancza-yacht.pl/userfiles/file/difiguf.pdf
    • http://zussobrance.sk/grafika/dokumenty/darizujegaka.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210901_FB0B5C8A6153D3C2.pdf
    • http://peoplefineart.com/assets/202109/files/20210914034844747924.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_off0000cc57.bin
b9cf6eac835e0e1fddc5444e23692b403c6279d5f5e114867d6acad1a98bd472
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 17500 bytes
font_01_sfnt_off0000f990.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 16792 bytes
font_02_sfnt_off000111a7.bin
6a398c9afe502f8c6e6a564da75fbf4c4bbbc823f7d6b5e73ab2d7805e094950
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 10904 bytes