Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f22e512652df463…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 06:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df8f1945f30af9dc1cba064d60a4e7f6 SHA-1: 8d0d0b6b28187a267b37b4f96815409525a6026b SHA-256: 3f22e512652df463966be07cea670ec0e8f3bce0263f481b1e88975afe7925f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Multiple heuristics indicate the PDF acts as a link farm, directing users to various unknown URLs, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nuocmambason.com/upload/fckimagesfile/d1ec648c68d2bda38bfec3be504f371c.pdf In PDF document text
    • http://achilleferolla.it/userfiles/files/mapaboxozukajipikiz.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/70601961458.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5aunvj96uc7ebq9qnoskvpbte7/dogoloxufeb.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/28822515620.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/xomaxuwomotawipulob.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/nalixepobofi.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/rupag.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/76025675428.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/40679494837.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/43639491214.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/79638559155.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe56a45c23---25597473242.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/fowupuxujogafepojojoj.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pc3t0d03skdrh6k7jt8f29e7p5/65588576661.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/93802978020.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/radomobezolibupoxafevivi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/vojowagolafexoligo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e30da1b8485---13317296634.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/hbed5aap15ln9fkge3bnfpbot6/39041021540.pdfIn PDF document text
    • https://cristalensi.com/public/File/modabotuwudifawudod.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/jibujaratukusowofomi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608381644fbc9---liramevivelusezonelufe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160702cdd72a05---bijefobepig.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/48206761198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+are+canada%27s+2+national+sportsPDF 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_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 19916 bytes
SHA-256: 74e17f79c7be2dd0dae2dc9cbabc91c5ef4406fb0c9ed2794ce81eb046bfb6e5
font_01_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 10760 bytes
SHA-256: 26ded88458cfd48bb9d6c07609b0016ab89363f10686741be42edb37d41c1b51