Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e84e1cb080d577…

MALICIOUS

PDF

109.2 KB Created: 2021-06-30 05:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b35ff6017a6519dcc2eea5f6592b467d SHA-1: 1260fb091103b3699c3f39ece7e14129c869b7a3 SHA-256: 88e84e1cb080d57733c626c52949a63fda997d4542313bb753f57b0e4658c66b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for initiating malicious actions. The PDF also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. This suggests the document's primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=the+lord%27s+labyrinth
    • http://montaze.org/democms/userfiles/file/44069164489.pdf
    • https://promise-land.com/upload/file/fufobovo.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1ad1ee3d7---vaxilufowuginegi.pdf
    • http://poorclarescork.ie/images/53277112591.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16084b61147fd1---70890394771.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e409622fb4.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d1b1e2e2---79002903540.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/21cb4a3228891298ddc09b2b12a66a01/2160196840.pdf
    • https://harrisitalia.it/uploads/file/71546805549.pdf
    • https://bharatbiodiesel.com/userfiles/file/jisoxosi.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/df45e0ee95379144f42959520ca0143b/sepenomazizito.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4361e3bee---sapenujupenor.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7287dd0e---zosuzubu.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7743c4336d---kisuvot.pdf
    • http://www.aadhar-interior.com/userfiles/file/57060975983.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb56f9d3b3---fogafijafotivujejawo.pdf
    • http://qazaqbanki.kz/data/content/files/61700428356.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/06a934daa5e3ea2093baf5b96b932ae5/rorawofodolorexu.pdf
    • http://agcslohian.com/userfiles/file/lobinoxofiwiremujizarikit.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/culh3g8k38hqve0j330vm1sfeq/79473094998.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/kixuwezodug.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160898443bb296---figowine.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_off00014066.bin
b509fca8048152fd929eab44f63e14671465a969311c54193afca67e1feb2f99
pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 22152 bytes
font_01_sfnt_off00017790.bin
7913eaefc436d398cb0b6a5991681160d2be1d1df5edfd8738a61b3b14fdd403
pdf-font-stream PDF embedded font (sfnt) at offset 0x17790 10596 bytes
font_02_sfnt_off00018fc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC7 16792 bytes