Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd52de641fbe2add…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 03:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cd837af19073de093215e685ff93400 SHA-1: 4038fee31ed6566756bd7191d32f85675e8e35a5 SHA-256: dd52de641fbe2add9bd6c21963e4430a628521adad84cd2341c559cc52a6d4a4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The presence of 'invoice' and 'urgency' lures, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f97btou9ompc5l5jgcgqla8c9k/riposozirasolo.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bc80be6d---91797208181.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/88016712634.pdf
    • http://www.ecostroyservis.ru/File/kovujakogolunegumobetazi.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8faca38d02d0dbaaa8fdb3a32ede417f/1166312624.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kvbee4o8kvaas719j3ovoh8h94/60422763140.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3e82f25f---78330451571.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea5132b44---nezowanirunenuvizu.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd3f9ca70---vewasexeza.pdf
    • http://grandp.ru/userfiles/file/28221203977.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a831b2f---75272706042.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0687827285f0e029b8898cf6aaaf26db/zoxisezegawex.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/44da08ec2153b9a6894fd77987ccea66/34501677054.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zawapesepukorebebebore.pdf
    • http://brandnewgoods.net/userfiles/file/ligudunefofadek.pdf
    • http://kovacsoltvaskerites.hu/images/file/jaruliwevo.pdf
    • http://studioindelicato.com/userfiles/files/dagoxipasewamonut.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6tt4uvp6v4iuva3f37uia8t5vg/28991613429.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/664ba112f8fa60bd7fb277f3b4baf68b/rifudiruted.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a8bbd632---zizikovusutu.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9569f66f5a3ef400e69a019133649f24/papen.pdf
    • http://rszm88.com/upfolder/e/files/20210605051907.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72efcddc80---38637252919.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec1e6bd88---runavamu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=porcelain+crucible+laboratory+apparatus+uses
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30c.bin
3c6091b8de5199e1cec9acc8141c89723716ff7e95073113fff400e67ad30d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 17616 bytes
font_01_sfnt_off00012101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
font_02_sfnt_off0001390e.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 1692 bytes
font_03_sfnt_off00014117.bin
430fc4ff76215ce4d475c80f0e0f1ad924925797b1db0598ab0ece2d704c6e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14117 10720 bytes

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