Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bbea27d18bec2a…

MALICIOUS

PDF

90.0 KB Created: 2021-07-25 22:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f16977544bb5ea416b9369dc01cd73b SHA-1: 049583ec0b208b32a0d9e1f5c207c98f94ec2286 SHA-256: 66bbea27d18bec2acaf19aabd9db7dad8c2441e7aee0cf8460b5c338287c0f62
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://educhina.mn/editor/files/labuxirorakamavegunujoti.pdf In PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b081ff1bdf---dafusufuridorerejukimur.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082a23e0fc3c---xojizonoxa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb33380a84---nenuwedazasogeluxixudiva.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/latixenajaxo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba00ecffe---59125408919.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vujavijodeg.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/37272183652.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081662cebf3a---12965265441.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e942ecd6ba---bovanusopufizel.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/saxekivebo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b013842db32---29770828041.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/rupifusiroxeluf.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/18436883450.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/72487674544.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811019d3bb6---vuvonexe.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/lijix.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/soxurefovagowubobep.pdfIn PDF document text
    • https://papiratisk.cz/soubory/muvifa.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2176e174c42b78f7f92f290330f75055/wexilegun.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a77379c9d8de3bd11245e5650f55a444/82735562892.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d93244a3---2527819877.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/sisonevesubamazubagabeda.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/nujixusigagovuzavuvejiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+opposite+of+a+foil+in+literaturePDF 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_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17116 bytes
SHA-256: b83f2f44f20ef018bb8082325f12b0d6067f6c3fb483b00a160c69fc66da3ee6
font_01_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 10548 bytes
SHA-256: b185fe2b5216d076b8f48bc64de74e7f2ab4cc5eb2d8efeae3b1c85fafaf3a71
font_02_sfnt_off00014188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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