Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6088880013827bb…

MALICIOUS

PDF

103.8 KB Created: 2021-08-12 10:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9c6f5b59dd27526e09b4cdb4f0938bb SHA-1: 9701e123c8217a36e66b16e6a03937c48f3b92b8 SHA-256: f6088880013827bbae1d4457fd21456e4748d43e59b1ff65e68b6e2a687dd845
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, presenting a link farm hosted on compromised websites to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, but the presence of numerous links to compromised CMS upload storage and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc2ac7181---zobojep.pdf In PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pazokazilafimukok.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d65841c6e---27389809839.pdfIn PDF document text
    • http://novichiha.ru/pic/file/61531199859.pdfIn PDF document text
    • http://bakoca.hu/files/file/mafulimepana.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6284facf46---mudosudamimerudawazos.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/guxirufituresowijo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dolowele.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/fefinawedadesopuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff809af89---20888510131.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b90db3c4c8c1152b04011de69bd590a7/fekutugupevitim.pdfIn PDF document text
    • http://bienbao.org/uploads/files/badafoberopoka.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/df5930c11454b1f34856fab9ecf15b67/25477879302.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e9c83397703fb0cfc4c69d3fb2097b37/39741445889.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/58286851666.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fda384f18---64761523963.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/t5dl994tguntlgfmltegg1d33u/zufuxepupov.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/44459084514.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/72585926684.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/genedofutajuv.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dakagb9hbhj27grg576mf2c8r2/52885216272.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608760f7871e1---6194687027.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34444354b---sitalimedifus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+legend+of+zelda+a+link+to+the+past+nintendo+switch+release+datePDF 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_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14626 19296 bytes
SHA-256: 7303af94a9be58c3a145f34ac2c522446f20d188540957093c4bc008c739367f
font_02_sfnt_off000176b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B8 11100 bytes
SHA-256: 9d2127ab41d5028cc328dba184d5905f8e66497d1c0b06002e32eaf1b9f19d9d

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