Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d4d6ff53d3f393…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 22:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d00ea39647a14cd5e92d5797e0d60cb SHA-1: 8672da175b5248ae9b5203e0a7c6664e3ec06aed SHA-256: 36d4d6ff53d3f393b55e06dcdeb7f0e52e2dce5b1604230f8be58e00c4547c24
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bigandtallking.com/userfiles/file/tolepuzoma.pdf In PDF document text
    • http://fitviewer.biz/files/file/lowuvawidogosamute.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/81421737646.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/paxexalodali.pdfIn PDF document text
    • http://quaint-house.com/77283754609.pdfIn PDF document text
    • http://nakatka.com/files/file/47469420035.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/9337628326.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jelfeolbie1vegnihtofpiakts/vewagesukobekebulepajoga.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124894c70263---dagozesiji.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dowoxikutizokevopamunesis.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/38311843104.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/34419928860.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a8631482---xuvijozufejobisoma.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/pelowumokesogikosu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941000b619e---josakotexobileloxo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046a66a78d---bakisenadejuxalumo.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/56355915427.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/salasuloxibotelorijoxade.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d982a23fc---39495719370.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/16404950494.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/17578483436.pdfIn PDF document text
    • http://proxima-design.cz/files/file/gizifisab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=physics+class+9+chapter+1+notes+pdfPDF 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 18264 bytes
SHA-256: 1a876a32136933fabfd4d13283a081008af262cd552069eb730280601be9db3f
font_02_sfnt_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 11052 bytes
SHA-256: c41c863c4fb9efb92c8a795f114b8de6fb0eeaee010ea6d5df06b51bab2adacc

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