Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03383592ab39dbb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 02:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2759326512e42133ef02d3d4dd0e208 SHA-1: 7a4c8d32e38f9270ea02038d093ac08d99220da1 SHA-256: c03383592ab39dbb624e9b181489c695c0b3daa88d3c5d058f5d89981aae0ac1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to other PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document is designed to funnel users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ecowaytechnologies.com/ckfinder/userfiles/files/21377243157.pdf In PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/faviwufemimowiwabasisani.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kijikatobiwo.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/zosilusokinepomakoga.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///dobomal.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/7730188567.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/53969170295.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/20783597307.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lepanifuvisalimikesidubu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xijerisololiroluf.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xemugawenufataxodotarikol.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/35287780867.pdfIn PDF document text
    • http://xn--80aggmy8c6c.net/UserFiles/File/zuvukezaligegifibazuzowu.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/64594262616.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f54d5f182---bageviwisunotunokizekor.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/galelemupogedo.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/64017767207.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/89916542799.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/9634165258.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/621732eeea68d1665f76e92d0befe1bc/41441115805.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/97d1269d60ef75cb984267e00a4992dc/14902465161.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/dopawitalo.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/wemabimedowakoxol.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/zogixokiwafotebujizid.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/dewisava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+and+sorcerer%27s+stone+freePDF 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_off0000bfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10616 bytes
SHA-256: 27620a6016df6774f20d9446e3f987a7f9e27697ce0ee8035a0e9492091c70c4
font_02_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 17496 bytes
SHA-256: a818437262f31ab3672ebbc4bdd3c2b59c77c1cac83049af99fb26fcce15b87a

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