Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ade50436fd947a1…

MALICIOUS

PDF

77.6 KB Created: 2021-08-03 01:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 165dab4f5298744c4a614fadccac625d SHA-1: 244a1f01f0ba70d6492dada1157a22ccad14a956 SHA-256: 8ade50436fd947a163a5337a7945a9c8397dd437c15b9fa82dce6e86db80dff9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://postelezmasivu-praha.cz/ckfinder/userfiles/files/tavexunopabelukimaxune.pdf In PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/vazumubomakupogaxoxo.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/46210684956.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/zojavibel.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xuwiverorobopefeman.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/1472854511.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mamibozuxiv.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/20294157264.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/daxafapovidekamoxu.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/4554527660.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a638de5a4---32359445461.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/sawezi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb66c15d48dbfa8410872d8cbf1aed40/badanufadozomuz.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/32905075007.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/31708777709.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e2aaca9b---89839854200.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb8ae4bf86f---fifadigutuminoverekisu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/15256658494.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/49297536736.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/40647181727.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3014e4db3---jukuvawox.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b761a3f0afe---62411221758.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zevimuwire.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/91312069123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=api+1104+21st+edition+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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 16196 bytes
SHA-256: 75a587eea780769949cf4a49b84b4024e05a35b3d85d75ffe56e19490aba4bbe
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10536 bytes
SHA-256: 36a497a354409d92525ecd80d728ad494412ece2f6cf51aa0d0c7bf597f13543

Open this report in the interactive analyzer, or submit your own file for analysis.