Malicious PDF — malware analysis report

Static analysis result for SHA-256 795b87e9b8c2cf18…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 00:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f41819f0a30998f2a0f5305bd864a78 SHA-1: d4974ccc5e941ff8ad1b08e629fd0104c871bffb SHA-256: 795b87e9b8c2cf185209d3317b3057f881784dfb4b23d5776a0c49431f989f66
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing unwanted software, a common tactic for credential theft or malware delivery. Several URLs point to compromised WordPress sites and other domains hosting PDF files, likely serving as part of a link farm or distribution network for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5e8d2830---27022858100.pdf
    • http://yasairamenbar.com/uploads/files/jofokureromubegixujumebi.pdf
    • http://studiobonvino.com/userfiles/files/tatane.pdf
    • http://staceyasp.com/UserFiles/file/69465528317.pdf
    • https://musikkursus.dk/userfiles/file/gakepajolamefesasamemozo.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/nireleji.pdf
    • http://soflocops.org/clients/83264/File/36075279795.pdf
    • http://pivotal-technologies.com/userfiles/file/mojinojesakatutopazupub.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/erjb28f7gnbla9r0jj3msfva4n/84543763760.pdf
    • http://studiotecnicomartani.eu/userfiles/files/66412686399.pdf
    • http://megaprestige.ru/uploads/files/15570404792.pdf
    • http://hoteldazegliotorino.com/userfiles/files/95703641570.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h5qfjhsasktrkpemb6pr65kl20/worezupu.pdf
    • https://gsacademy.ge/uploads/files/92873411162.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608554a128ac5---86005987566.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075131dd173c---pesawubufivedamog.pdf
    • http://guojingmall.com/userfiles/file///kotedibilekimoronido.pdf
    • http://vizesblokk.hu/files/file/64664974698.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fh906ovuf9j7qbf25b0csdgenq/12098998425.pdf
    • http://uklearningnetwork.com/userfiles/file/zelajapaxine.pdf
    • https://evrenmentese.com/upload/ckfinder/files/50156870111.pdf
    • http://pspectr.ru/userfiles/file/94900161025.pdf
    • http://shijijiaming.cn/filespath/files/20210826010917.pdf
    • http://rideco.hu/upload/file/gepuguwipuxir.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ac4e9753b01a8913186b074e35c8d819/mukawojifoxoderexavodu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=can+i+copy+from+a+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_off0000e145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16792 bytes
font_01_sfnt_off0000f957.bin
7773e7ec205f064d0a9ea64629e05df04fd78aa722dbd914ac6e99806552128d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16980 bytes
font_02_sfnt_off000123ee.bin
91529d44c69a44ac715c7c54439aa8f70362c8d22dfdc763a8f2db5957f2136e
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 10484 bytes