Malicious PDF — malware analysis report

Static analysis result for SHA-256 484873ecaf2d389d…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 21:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19c2a0c20755d6461b83980aec270153 SHA-1: 88f06850b628656b04cdaccc9e5cb346e2c5a99d SHA-256: 484873ecaf2d389d0851986e4fa2f9a845c86b6a9e02c268618e2228b835a0fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://c-amc.com/upload/files/tokezezobomelujeginajizex.pdf In PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4bad344a---jitagotipin.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9741a62b7c---77049779723.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/pozubulokozelokemutuvabab.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42cfc1ba5---44559409812.pdfIn PDF document text
    • https://curvy.tw/upload/files/buzufuzisovamijibixaweg.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/monuturaneraso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea8a66da4---73579335051.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f342a9d1---wuxogoxinap.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/limibupekulonebilaso.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/44744556630.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c96ebd1c---gesagud.pdfIn PDF document text
    • http://fotossc.pl/_files/file/73300469710.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/pukola.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/79460089544.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tokepelira.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e01610ad62a5a0ba73e4e6b420f9727d/gogopezoretelizexoxaxexe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/736f94fddf1425a595b3c5561355e089/mumoliniso.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736061be78e---tinirosedazatideto.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xuwabomoberojiwivuruju.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pezofisupisipinege.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/25865451236.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/dipaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=extremity+swelling+icd+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 16580 bytes
SHA-256: 708eabcdabd451da99cc06798f441461744d55fe74b44d7bc976ec13bc8dc235
font_01_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 10888 bytes
SHA-256: 01eabcc3242b34ee338efe9493bf8f4eea53ae2e70f996c63a0c22e9d41908dd
font_02_sfnt_off0001432a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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