Malicious PDF — malware analysis report

Static analysis result for SHA-256 a147bf9c18431bba…

MALICIOUS

PDF

83.0 KB Created: 2021-08-02 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6aee2d39cb6771c834ace7d4029cba2 SHA-1: 38e3152ec6ac50b776ea8c588b5298e8372274ad SHA-256: a147bf9c18431bbaf364d13064b67fa628658271d5786778c34b773bdceb4f5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to manipulate search engine rankings or redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=saxon+math+3+worksheets+pdf PDF link annotation
    • http://4seasonstours.in/userfiles/file/sujelexolapodova.pdfIn PDF document text
    • http://come2menorca.com/images/file/99538174490.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/26373894456.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bb6dc219---kufukisupirorifikufo.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/43095172013.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/kenalebifemolarato.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e26idtvtl46jr1r54qv4g7l333/saxiguxitema.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0e87b009f10475f00dac368e28fd13fa/95290791016.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/rimewunenedamasigimunop.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/47820167301.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/nuzabuzokasoje.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/gadukozavepote.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4e178c1f---29000555416.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vewiduxesiraxakudit.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/32805707373.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c2407ae4a5ecd65e1dbc295256653ac1/xupivu.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/21890452210.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ffe25480---tepiramenuropij.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c87b0a920252f20e11a8ab26344c7a4e/penevizu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e656f3cc---65154037147.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/lixamodojova.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/5124133770.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 11152 bytes
SHA-256: d4e0c41330514e924454a627aa4b4e3176270d48d2dec7b517f1f5fee42365f2
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 17184 bytes
SHA-256: 973861484257028ee31c72424fab7ce2ede2ad2bf4b5ce383902a68e0722ecea

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