Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd65de20ba1fb4ef…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 06:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79586be2b14bb34dbc34aae0a056a94e SHA-1: 9a660087e8411de301bf05e5686170e856a02075 SHA-256: fd65de20ba1fb4efe12514b04de7b5fc58402389bb94211ceb0efc920ee0c259
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and the document's structure suggest an attempt to redirect users to malicious or phishing sites.

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 https://brtim.com/uploads/wysiwyg/files/97862221658.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/rflqtmvkpvdcuo9odr96do0sjs/96338367422.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nifewofezivumizuw.pdf
    • http://vksraja.in/fckeditor/upload/file/mirimaxeduv.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t2snfdc5jtd5vs6pspclhjls4p/26997189383.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q6s8recs53dt1ojvam9ict5kmu/80693080913.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/08981017c45a7a529d9469bd92a006c5/6481797483.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f62234bc989e7944e0898c9d0aa27dcb/1540358550.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98c4f2bf2---newafazonefevokafik.pdf
    • http://abc-tel.ru/data/File/17462334823.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af71ded82a---duvevevobunoxipasub.pdf
    • https://nestsearch.in/admin/uploads/file/23188084818.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/34fb4e9361b65604ea830ec236296da6/95630409463.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a78e128e---57288287615.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf07819c81f---71926430773.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2n5me17naeh1csot2qr03g5q4h/58242889258.pdf
    • http://solamsys.com/userData/board/file/livujuvewukote.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e8592cf4824ce8e3534b7513da205579/xikepugejo.pdf
    • http://bebelino.ru/userfiles/file/732866967.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5638f4fb5d---63289712399.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45657aaf5---vopojuvubuxirurumoxe.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8edbfa36d284acb11212e0ea091ef9c/59488349405.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=infrared+photography+definition
    • 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_off0000f223.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 16792 bytes
font_01_sfnt_off00010a3a.bin
8f8d6b7b02e2a0ba5ebd2940cbd3481943cfa1f7b7f8f030b8839d8ee7bf2709
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10628 bytes
font_02_sfnt_off00012234.bin
ac0b749152fa84183758bd43ddfc0f5a2f110bdaf775c2e1099cff053940534b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 17504 bytes