Malicious PDF — malware analysis report

Static analysis result for SHA-256 392513aceb97b041…

MALICIOUS

PDF

87.5 KB Created: 2021-07-25 01:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df1c13d90dc35fc5c0277c45c6ce9ec7 SHA-1: 66573a0c4062ba9215519256fb7a491cd66fdc3a SHA-256: 392513aceb97b041dca519e32b9b9a9d4f50f2071c74cb2a1ae6d4756a9b7c3a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress sites and a lure to execute commands via the clipboard. This suggests the document is designed to trick the user into running malicious code, likely by copying and pasting commands into a shell, which aligns with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://giasuthanhdat.vn/Images_upload/files/44177134289.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5b75v7rtt3ca9ligq8ebodtjuk/lexarabumawenuviregeza.pdf
    • http://ogbchurch.com/clients/880797/File/42596347408.pdf
    • http://iltorg.ru/upload/file/wadogavutasaxunasuzewed.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c241474bd9---54068128842.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54150338d---51440804711.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/74308421052.pdf
    • http://curry-box-deluxe.de/userfiles/file/71276802372.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f239b38cb0c---48641214763.pdf
    • https://rotitelor.com/contents//files/6948967940.pdf
    • http://baigeleather.com/userfiles/file/42587297603.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072328dc813b---17198041368.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/aa11e1627bb913ac263b51fd6cc2fee7/75897882574.pdf
    • http://metabolit-plus.ru/files/file/tolojonijoxosiva.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/xapazagulitomeda.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcbf595afb8268775351b690f2f60ba7/25869579669.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6f8054b3cc8ee98932b2b321c1497f5c/47989302723.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1f832d46---zogese.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/rejiwosaridelabem.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a90aefd3802---50382319718.pdf
    • https://dietacud.eu/upload/file/xarotirovugexotakumeli.pdf
    • https://recapress.com/ckfinder/userfiles/files/sorobulomilubes.pdf
    • http://emurus.jp/userfiles/file/mejonapapuwunafulogerito.pdf
    • http://domholidays.com/userfiles/file/tivixosusopotu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=whats+good+at+kung+fu+tea
    • 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_off0000f308.bin
847604474c0bd05a3982c4c3de1a13349a93bcd67228dc6727344ba2fa67b75a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 17156 bytes
font_01_sfnt_off00011fd9.bin
9ecc856e0a41b4736f2d6658dd74563be2a9234415fd87fc0a098513c1af9227
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10580 bytes
font_02_sfnt_off000137d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16792 bytes