Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c243ab2506573c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 19:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8812f7ffa251fa93fd75dea9fc4c764 SHA-1: 2dc93d456203184b55ee625deb82e52bf7937ba8 SHA-256: 30c243ab2506573c5a7423f93c3827061c99df60f5db274ee5cbf8ce8f0fe14d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://urgentcarepb.com/userfiles/file/gelejaponesorixenalina.pdf In PDF document text
    • https://ascii.tn/web/cgi/file/48602204538.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/69999276193.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/foxufadamob.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/21986023626.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/11245237897.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1dbbe18aad4ef80282d4af5dc89c80bb/xusobozukubide.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/lavawife.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9fab8728---sofojedujit.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca73ba33e---63976937963.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/pukanewimomokot.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/65753527371.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/luzugoxalupik.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/64647703971.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/josozat.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/mudumarofezon.pdfIn PDF document text
    • http://wohingltd.com/userfiles/defibaxajuwigisefomiz.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210902170225.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/bururo.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/temaso.pdfIn PDF document text
    • http://indexone.ru/upload/file/budazufupa.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/vejotifezidemopafufifaku.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccade6619e600f99ba25a1cf47b24040/tanokeligevudatowig.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/95269439898.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/54129095877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+custom+rom+androidPDF 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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10576 bytes
SHA-256: 98271fac04a279285df097d076b4cab8f868480b668443d0fba564957e1dab80
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 17464 bytes
SHA-256: 53b1855132752fe39cece04e41ab9ccf03f86b9b70f19898045103c77e55c584
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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