Malicious PDF — malware analysis report

Static analysis result for SHA-256 e838b949ff08af86…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 06:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33ebde430d2c130b970f833f55a1e7f8 SHA-1: 649cebe2843a1594bde380dba96b2c22619f59eb SHA-256: e838b949ff08af865f8595a0ed4a67a71bd4d277d1a33f319ec98898a026a4dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6dt12h84q1f237hqjptcoj04fc/bevotowafaliwixuvapeku.pdf In PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/46383232148.pdfIn PDF document text
    • http://lovesenergy.com/file/mawomewivadu.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/temixamidewibarevezukun.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/20982039671.pdfIn PDF document text
    • https://matricula.arendic.cl/files/nezelokuviro.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613988fe94352---mutonaluragevedul.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/24136971483.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3860765d3d75c701e1825f91b726863b/belom.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/61988988962.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jaluxamosekenusov.pdfIn PDF document text
    • http://idroter.org/userfiles/files/jazapekegarudo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/14479881786130111cdf337.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/roxag.pdfIn PDF document text
    • http://emeat.ru/var/files/94347149983.pdfIn PDF document text
    • http://domplus.su/userfiles/files/dewodexamemaxewikewiriler.pdfIn PDF document text
    • https://digireg.ch/upload/4514477705.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/2808719844.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddc1e575---89733015424.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4dbddf0e---doxoxibagej.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/dipemo.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/53987619811.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfac7ca86---sudejukupuzokobek.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/07/xesofaniguxujumijababokus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+button+style+themePDF 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_off0000be95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE95 17120 bytes
SHA-256: 5d20bd87e6472a2eef90bc82af7d9f02598ee48dfe4d3c95fca397a93fe7ee3f
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 10684 bytes
SHA-256: 15b00e672106786d4a53fc569f04a4561268aeb7ff5cd74de090bc73e1306042

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