Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a4edcde467de43…

MALICIOUS

PDF

79.8 KB Created: 2021-06-25 22:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 466eb52fe8b8d7c735cec0d0590fab84 SHA-1: 0e7357590cc81ab6aedd3e5c04289e6bea6b38d0 SHA-256: 09a4edcde467de4317429b7c64a20bd546a5b1234ee112c6c7bc8a11670e6751
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous URLs hosted on compromised CMS platforms, which is a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farm indicators strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c82cf63d66b3b3eec93bd1a70e1776f3/13371491306.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc089744eb---90819342652.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f3dae2686658c40bf84d668fb9e697db/37596301235.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f0b3bf838e4bbe35eda778018e3e4711/wuvira.pdf
    • https://mayurherbal.com/userfiles/file/botipujajut.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d29fc89cbce99bb58f393b4580158602/66962057539.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875543ef47---21564609196.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/385888c13e29cfae6b82184461c99728/88430879723.pdf
    • https://fentesmakina.com/paket/upload/files/10777023468.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7aa2962f2036f7f72edb653c7c172dbd/gizumadoxurevuwelegejoduj.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ke27f5udd51qs9j08p2q8396f7/votikerupijis.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e5bc2308dc5fafbca293c1327e0b908b/xonopuxomanave.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gv2l9oi781r0omve0fkqjnflc2/75001891675.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ce5oaete34v1acg1hmrlfit83f/gobanojujufeboked.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb2a84413---vuganavivokoxupukotepowo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46178eaa3---nawurojulomovazapute.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c455de66b2e---kavuroduwezomak.pdf
    • http://messtores.ca/fck_user_files/file/26134009717.pdf
    • http://fitviewer.biz/files/file/87448010022.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gate+engineering+mathematics+previous+year+questions
    • 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_off0000d29d.bin
5f1c6d159c460298ffb72990c07e77058aff89d98eef289e3c3dde72927e0f7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 17324 bytes
font_01_sfnt_off0000ffe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 16792 bytes
font_02_sfnt_off000117fe.bin
3779e1ab8539cfe25c913da50e8bd1f93086aaa2ff404bba02fc080752b42cb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 11240 bytes