Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9c34cc6ae047ee…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 17:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d52435ba0a29b21142b3d7543f90284 SHA-1: c7be00f434d25868afbb38f43480cdc2001f911b SHA-256: ba9c34cc6ae047ee72da6f1188cc0a004beeb1866ae05080fa40e08a34cec0c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=fiche+de+lecture+l%27avare+pdf
    • http://rosg.net/sa_upload/userfiles/file/20210901135304.pdf
    • http://portalcom-b2b.es/img/user///file/_0007651001619869610.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/i4lvkv36m9h45v52e357aerq23/josobuteb.pdf
    • http://moneymaker-gold.de/files/95628924697.pdf
    • http://myflora888.com/ck_files/files/49278675131.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1bffb73490db8163cdde731c521d7889/79663647902.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3e9d72ba---zodemasabudoxu.pdf
    • http://abovomedia.hu/_user/file/pobofikowovojiwebexotobup.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b3ad411fa690e713db1f8ac46417534a/lutafoxerabokuneved.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/34115486706.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/xevelerijebo.pdf
    • https://migger.dk/userimages/file/232831965.pdf
    • http://moveworldtogether.com/datas/files/jefowitarekomalatirakig.pdf
    • https://daiichitravel.com/uploads/news_file/67215890110.pdf
    • https://faltprasten12.se/anvandarbilder/70/files/51324511109.pdf
    • http://hitecds.com/userfiles/file/31111358905.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa6003d6c---32713684141.pdf
    • http://phutunggiahungoto.com/uploads/files/66431395520.pdf
    • http://etre-belle.su/images/file/giwuxiv.pdf
    • http://comp-art.ru/userfiles/file/lalobojodujalibipoxewazu.pdf
    • http://nilesk.com/userfiles/file/32522014621.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/93789253171.pdf
    • http://areaengineeringsrl.eu/userfiles/files/17011202354.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fceb3924740027ec44ea9f68cf497e6e/masuxanediwifirafi.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c6e798539---gubusidas.pdf
    • http://www.irrv.org/uploads/files/xidatadowepavaluwulu.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7jt3qpq4vknvljgdh5a9h9va92/20523658376.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/444ac59197e88af616ace7946767aa80/zoxorefatotuwetufes.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_off0000f83d.bin
28a057ae6c4ba88e79398080d0be93bfd4aa26142f016e77aebf1965624633f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 23392 bytes
font_01_sfnt_off00013294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 16792 bytes
font_02_sfnt_off00014aab.bin
f658b66b17440aa1280dc7519f47ce2aaf6dac83ddabfa0ae46a6090ff2f2562
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 10500 bytes