Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3f813e1ed7f6ee…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 21:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b4c67d95ae4f99f79a7fac64a984d25 SHA-1: 25a20710946bb029e0298517a94bd263797d4311 SHA-256: 9c3f813e1ed7f6ee2ac2c2aa83ad2a65c5e44ff92259a9d21b23dcef51a7b646
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple URLs pointing to link farms on potentially compromised or disposable domains suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/62544737955.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4qammik30a0jpbif12gcc83ahv/xalopavodufubasapibonipot.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096efc8d97e9---visalanunovixeb.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82783c6af5---83833108674.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/14780770439.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/xanegozefatid.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lij815aimba4lgc1nehpas6fd9/67549655634.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/zorosorepedemasitefopa.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/88943662463.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/nufudixetebot.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/61ccea319bc09dd178ac9fde0c15701d/vagumuguki.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e129743be25---57655202888.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797750c1777---notazeroravaraboreze.pdfIn PDF document text
    • http://www.miwon.vn/app/webroot/uploads/files/gobazokutusapolevalus.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fd9edd2a---48974829310.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6df1gsu9d4pvpg2dmppgp727r3/zitevi.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/22251904664.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/namopagijibexewubunubosip.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72e634603---lulovejorezekuguz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfaedca95---32763091750.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffdafb29ec58210b595d1595a5d2c96a/wuvesisawujekanugadel.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/demejeti.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/81279488081.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8f78a863---71521828937.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/murofinomemimezivavola.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e64poiqmrv0p4pper86ftma30d/65665096394.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/pevososokejulibobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=eso+glyphs+how+to+usePDF 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_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10356 bytes
SHA-256: be99f1449f72f17171c3fb99b3bbf6e4e26781fe900e4ad5c47158831f7c95e7
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 18080 bytes
SHA-256: 094179d30a6f9c578e85c13f57f35118f3935a2376916d88db4753b2bd646567
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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