Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb81fe2585f029e…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 16:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db073966a921375e17e311700861442 SHA-1: c3874809df54324af16f8a1f1d678ec4ece731ae SHA-256: ceb81fe2585f029e9e92439916e57721d2d9939e18c228d6d8277fb8bef582d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://ibb-online.ru/f/file/79248650757.pdf
    • http://aven.su/userfiles/file/68169306060.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/621973168.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/b97vi1i7pq76qmg7sfs1kvebjh/58681697919.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/xafiladilo.pdf
    • http://weberstellen.ch/userfiles/file/36106177588.pdf
    • https://kaptenhoki.net/contents//files/wixuvipewunej.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/vutotutimopilenawo.pdf
    • http://espacioschillout.es/images/admin/file/zifaporamazu.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608339943cc30---88985308501.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8ce4bcb0c26f1b5070a6b7ebe987dc44/konegipataperu.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4uc9v2ft7l7blshsusa1njhue2/sadizuloralad.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f9f982bd---37595219464.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/137881c28d05bf9ccf612b30a740e18f/54490311066.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9tbgncimgpmhh2keenlvvuhao4/82733699464.pdf
    • http://narnivet.com/userfiles/files/janipobe.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a212c02c---77077455453.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/rarulujoregowapikil.pdf
    • https://aronabritcan.com/userfiles/file/mofaxeze.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4e876004---39113992870.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56828b620---bigiwiwuk.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b6c5fc09bd0bd39c4a32605a93edb0f3/kewenotised.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=daily+forex+compound+calculator
    • 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_off0000e6b8.bin
4f77b2eed6b54696e6f61dd9d0074d2fed66144bdb5502cda6dc039541ae4380
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 10928 bytes
font_01_sfnt_off00010009.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 16792 bytes
font_02_sfnt_off0001181b.bin
a1a8a4a81bd8122541d38de6b0878c669b68984b97d221ec17dce223dcc44917
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 16832 bytes